Patients participate in a physiotherapy class in the hydrotherapy pool in the Physiotherapy department at Milton Keynes University Hospital in Milton Keynes, central England, Britain, June 8, 2018. REUTERS/Hannah McKay SEARCH "MCKAY NHS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES 

A woman swims during a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

A woman takes part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

A woman gestures as she takes part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

Ppeople take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

People take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

People take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

People take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

People take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

People take part in a water hydrotherapy class at a sports Complex in San Jose, Costa Rica September 26, 2017. REUTERS/Juan Carlos Ulate 

Thai veterinarian Padet Siridumrong (L) treats the wounds of Fah Jam, a five-month-old baby elephant, after a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY 

Fah Jam, a five-month-old baby elephant, is pictured in her enclosure at the Nong Nooch Tropical Garden in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, receives help from handlers as she arrives for a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, receives help from handlers as she arrives for a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, receives help from handlers as she arrives for a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, is pictured in her enclosure at the Nong Nooch Tropical Garden in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, is pictured in her enclosure at the Nong Nooch Tropical Garden in Pattaya, Thailand, January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Handlers wash Fah Jam, a five-month-old baby elephant, before a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Thai veterinarian Padet Siridumrong (L) treats the wounds of Fah Jam, a five-month-old baby elephant, after a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Fah Jam, a five-month-old baby elephant, plays with a handler at her enclosure at the Nong Nooch Tropical Botanical Garden in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

Five-month-old baby elephant Fah Jam swims during a hydrotherapy treatment as part of a lengthy rehabilitation process to heal her injured front left foot at a rehabilitation center in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. REUTERS/Athit Perawongmetha TPX IMAGES OF THE DAY 

A handler feeds Fah Jam, a five-month-old baby elephant, in her enclosure at the Nong Nooch Tropical Garden in Pattaya, Thailand January 5, 2017. The baby elephant was injured at three months old when she got stuck in an animal snare put up by villagers to prevent elephant intrusions in Chanthaburi province. The hydrotherapy is thought to help her exercise her bicep muscles and help her walk again as she has been refusing to stand on all four legs. REUTERS/Athit Perawongmetha 

A man gets hydrotherapy at the Lukacs Bath in Budapest, Hungary June 23, 2016. REUTERS/Bernadett Szabo SEARCH "BATHS" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY 

The abbey (R) and the abbey retreat are pictured in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

The abbey (L) and the abbey retreat are pictured in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Immaculata walks past the entry hall at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Gertrudis and sister Bernada (L) walk towards the abbey in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

A guest room is pictured at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Immaculata talks to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Immaculata poses at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Immaculata talks to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth and sister Bernada (L) walk at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth poses at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Bernada poses at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth talks to sister Bernada (R) at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Gertrudis poses at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Gertrudis runs the shop at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Bernada talks to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activites to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth (C) talks to guests at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SOCIETY RELIGION) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: RELIGION HEALTH SOCIETY) 

Sister Elisabeth provides a Kneipp hydrotherapy to a guest at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH RELIGION SOCIETY) 

Sister Elisabeth arrives for providing a Kneipp hydrotherapy at the abbey retreat in Marienkron April 11, 2014. The abbey retreat, founded by German nuns who came to pray for the souls on the other side of the Iron Curtain in 1955, caters mainly for older customers who come to relieve their mobility problems or aches and pains with Kneipp hydrotherapy. Since opening to the public in 1969, Marienkron has expanded its range of activities to include massage, pilates and even Qigong, but at its heart it remains a spiritual oasis designed to revive body and soul through healthy living and prayer. Picture taken April 11, 2014. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SOCIETY RELIGION HEALTH) 

Britain's Catherine, Duchess of Cambridge, speaks with staff and children in the hydrotherapy pool, during her visit to the Naomi House children's hospice in Sutton Scotney, southern England April 29, 2013. REUTERS/David Parker/pool (BRITAIN - Tags: HEALTH SOCIETY ROYALS ENTERTAINMENT) 

Britain's Catherine, Duchess of Cambridge, speaks with staff and children in the hydrotherapy pool, during her visit to the Naomi House children's hospice in Sutton Scotney, southern England April 29, 2013. REUTERS/David Parker/pool (BRITAIN - Tags: HEALTH SOCIETY ROYALS ENTERTAINMENT) 

A girl wearing a brace on her leg is assisted by a physical therapist during a hydrotherapy session at the Association for the Aid of Disabled Children (AACD) in Sao Paulo April 3, 2012. The AACD, a non-profit organization that began in 1950 with just 14 patients, now works with some 8,000 young victims of disabling conditions and diseases such as cerebral palsy to give them better physical skills and improve their lives. Most of the patients are from impoverished or broken homes. Picture taken April 3. REUTERS/Nacho Doce (BRAZIL - Tags: HEALTH SOCIETY) 

Luiza Ezaledo, 2, is assisted by her physical therapist during a hydrotherapy session at the Association for the Aid of Disabled Children (AACD) in Sao Paulo April 2, 2012. The AACD, a non-profit organization that began in 1950 with just 14 patients, now works with some 8,000 young victims of disabling conditions and diseases such as cerebral palsy to give them better physical skills and improve their lives. Most of the patients are from impoverished or broken homes. Picture taken April 2. REUTERS/Nacho Doce (BRAZIL - Tags: HEALTH SOCIETY) 

Luiza Ezaledo, 2, undergoes a session of hydrotherapy at the Association for the Aid of Disabled Children (AACD) in Sao Paulo April 2, 2012. The AACD, a non-profit organization that began in 1950 with just 14 patients, now works with some 8,000 young victims of disabling conditions and diseases such as cerebral palsy to give them better physical skills and improve their lives. Most of the patients are from impoverished or broken homes. Picture taken April 2. REUTERS/Nacho Doce (BRAZIL - Tags: HEALTH SOCIETY TPX IMAGES OF THE DAY) 

A physical therapist supports Luiza Ezaledo, 2, during a hydrotherapy session at the Association for the Aid of Disabled Children (AACD) in Sao Paulo April 2, 2012. The AACD, a non-profit organization that began in 1950 with just 14 patients, now works with some 8,000 young victims of disabling conditions and diseases such as cerebral palsy to give them better physical skills and improve their lives. Most of the patients are from impoverished or broken homes. Picture taken April 2. REUTERS/Nacho Doce (BRAZIL - Tags: HEALTH SOCIETY) 

An elderly woman undergoes therapy in a pool on the premises of the Gerontological Association Costarricense in San Jose September 27, 2011. According to the National Council for the Elderly (Conapan), adults aged 60 and up comprise 9.5 percent of the total population of almost 5 million inhabitants and it is estimated that in the next five years the adult population will grow by 15 percent. The authorities indicate that the Costa Rican population faces an aging problem because of the process of demographic and socioeconomic shifts as well as rapid development of science and technology. According to the U.N.. the world population will reach seven billion this year, making the population almost quarter what it was in 1960. Picture taken September 27, 2011. REUTERS/Juan Carlos Ulate (COSTA RICA - Tags: SOCIETY) 

Elderly people undergo therapy in a pool on the premises of the Gerontological Association Costarricense in San Jose September 27, 2011. According to the National Council for the Elderly (Conapan), adults aged 60 and up comprise 9.5 percent of the total population of almost 5 million inhabitants and it is estimated that in the next five years the adult population will grow by 15 percent. The authorities indicate that the Costa Rican population faces an aging problem because of the process of demographic and socioeconomic shifts as well as rapid development of science and technology. According to the UN the World Population will reach seven billion this year, making the population almost quarter what it was in 1960. Picture taken September 27, 2011. REUTERS/Juan Carlos Ulate (COSTA RICA - Tags: SOCIETY) 

A osprey with a broken bone is held before undergoing surgery at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS) 

Veterinarian Dr. Yigal Horowitz (C) prepares an osprey, who has a broken bone, for surgery at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS) 

Veterinarian Dr. Ariella Rosenzweig prepares an osprey, with a broken bone, for surgery at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS) 

Blackbird chicks open their mouths during feeding at the Wildlife hospital in Ramat Gan near Tel Aviv June 16, 2010. The hospital treats about 2,00 animals each year, many of which are rescued after suffering injuries in the wild. The hospital, run by the Ramat Gan Safari and Israel's Nature and Parks Authority, also offers the animals treatments like physical therapy and hydrotherapy. REUTERS/Baz Ratner (ISRAEL - Tags: ANIMALS)