A customer stands on tiptoes as she reaches for some hand wash in a Tesco supermarket in Manchester, Britain, March 15, 2020. REUTERS/Phil Noble

Two year-old Lily Mills dressed in a ballet tutu dances as she poses for pictures in the spotlight on the stage of the Harlow Theatre during a break at a dress rehearsal for a children's ballet show in Harlow, February 18, 2015. REUTERS/Russell Boyce (BRITAIN - Tags: SOCIETY ENTERTAINMENT)

Jiejin Qiu, who is six month pregnant with her first baby, poses underwater during a photoshoot at a studio in Shanghai September 5, 2014. REUTERS/Carlos Barria (CHINA - Tags: SOCIETY POLITICS)

U.S. Naval Academy Midshipmen who declined to give their names, tiptoe through the water in front of "Pip's Dock Street Dogs" after the Chesapeake Bay overflowed its banks at City Dock in Annapolis, Maryland May 16, 2014. Picture taken May 16, 2014. To match Special Report SEALEVEL-FLOODING/CHESAPEAKE REUTERS/Mary F. Calvert (UNITED STATES - Tags: ENVIRONMENT SOCIETY MILITARY MARITIME)

A woman practices yoga in Times Square as part of a Summer Solstice celebration in New York June 21, 2014. REUTERS/Eric Thayer (UNITED STATES - Tags: TPX IMAGES OF THE DAY SOCIETY)

A boy touches a shrapnel hole on the door of a residential building, damaged by what locals say was overnight shelling by Ukrainian forces, in the eastern Ukrainian town of Slaviansk June 12, 2014. Ukraine's new president signaled on Wednesday he would be ready to hold talks with opponents in eastern Ukraine if pro-Russian separatists waging an insurgency there agreed to lay down their weapons. REUTERS/Gleb Garanich (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)

A model takes part in the "Trashion" fashion show on the roof of a building in the Brooklyn Navy Yard in the Brooklyn borough of New York May 31, 2014. The show featured designers who used recycled items such as coffee filters, tissue paper, grain sacks and window screens. REUTERS/Carlo Allegri (UNITED STATES - Tags: ENTERTAINMENT FASHION SOCIETY TPX IMAGES OF THE DAY)

A "scissors" dancer performs in a national scissors dance competition at Lima's Exposition Park, May 18, 2014. The Danza de las tijeras, or scissors dance, is a traditional dance from the Peruvian southern region of the Andes, in which two or more performers take turns dancing while accompanied with music from a harp and a violin. Dancers would display various skills and moves, which include cutting the air with the use of a scissors. REUTERS/Enrique Castro-Mendivil (PERU - Tags: SOCIETY TRAVEL)

Dan Reynolds (R) of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

Dan Reynolds of Imagine Dragons performs "Tiptoe" at the 2014 Billboard Music Awards in Las Vegas, Nevada May 18, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: ENTERTAINMENT) (BILLBOARDAWARDS-SHOW)

An Andean dancer performs during Day of the Dead celebrations in Nueva Esperanza cemetery at Villa Maria, in Lima November 1, 2013. Each year people visit the cemetery, one of Latin America's largest, to honour the dead. REUTERS/Enrique Castro-Mendivil (PERU - Tags: SOCIETY RELIGION)

A model and professional ballet dancer presents a creation by Kazakhstan's designer Kamila Kurbani during Kazakhstan Fashion Week in Almaty October 26, 2013. REUTERS/Shamil Zhumatov (KAZAKHSTAN - Tags: FASHION)

Children play with ornamental objects made from remnants of weapons at a basement in the Duma neighbourhood in Damascus, on the second day of Eid al-Adha October 16, 2013. Abou Ali al-Bitar is using remnants of weapons including rockets, mortar shells, bullet casings to create ornamental objects, musical instruments and toys for children to entertain them during Eid al-Adha. Picture taken October 16, 2013. REUTERS/Bassam Khabieh (SYRIA - Tags: RELIGION POLITICS CIVIL UNREST CONFLICT)

Serena Williams of the U.S. reacts during her women's singles tennis match against Mandy Minella of Luxembourg at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT TENNIS)

A couple embraces on the beach at Coney Island in the Brooklyn Borough of New York, May 26, 2013. Seven months after Hurricane Sandy, New York's beaches have reopened before the Memorial Day holiday. REUTERS/Keith Bedford (UNITED STATES - Tags: SOCIETY ENVIRONMENT TPX IMAGES OF THE DAY)

Children play with a pair of binoculars at the Imjingak pavilion near the demilitarized zone (DMZ) which separates the two Koreas, in Paju, north of Seoul April 5, 2013. North Korea's explicit threats this week to strike the United States with nuclear weapons are rhetorical bluster, as the isolated nation does not yet have the means to make good on them, Western officials and security experts say. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: POLITICS MILITARY)

Brazilian dancer Roberta Marquez of The Royal Ballet demonstrates a movement to students after a masterclass with dancers of the Royal Opera House at the Rio de Janeiro Municipal Theatre February 23, 2013. The Royal Ballet will open the 2013 season of the Municipal Theatre Rio de Janeiro with gala performances from March 1 to 3. REUTERS/Ricardo Moraes (BRAZIL - Tags: SOCIETY)

A couple dance the tango at a beach bar near the river Spree in Berlin September 16, 2012. On sunny weekends, tango enthusiasts meet at the beach bar in front of the Bode Museum to perform. REUTERS/Fabrizio Bensch (GERMANY - Tags: SOCIETY)

A diver trains at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 24, 2012. REUTERS/Tim Wimborne (BRITAIN - Tags: SPORT OLYMPICS DIVING TPX IMAGES OF THE DAY)

Toronto Blue Jays shortstop Yunel Escobar makes a diving catch on a line drive hit by Los Angeles Angels of Anaheim batter Torii Hunter during the first inning of their MLB American League baseball game in Toronto June 28, 2012. REUTERS/Mike Cassese (CANADA - Tags: SPORT BASEBALL TPX IMAGES OF THE DAY)

Russian soldiers practise their routines for the forthcoming victory day parade during a rehearsal in Stavropol, April 27, 2012. Russia marks the victory over Nazi Germany in World War 2 on May 9. REUTERS/Eduard Korniyenko (RUSSIA - Tags: MILITARY ANNIVERSARY TPX IMAGES OF THE DAY)

An artist paints a giant egg-shaped figure during Easter art festival in Moscow April 15, 2012. REUTERS/Maxim Shemetov (RUSSIA - Tags: RELIGION SOCIETY)

A dancer of the Georgian National Ballet "Sukhishvili" performs in Tbilisi, January 27, 2012. It has survived communist oppression, the Cold War, the break-up of the Soviet Union and counted Josef Stalin and Elvis Presley among its admirers, but at its heart the Georgian National Ballet has always been a bit of a family business. Founded nearly 70 years ago by the husband and wife team of Iliko Sukhishvili and Nino Ramishvili and initially named the Georgian State Dance Company, the troupe has travelled from the back offices of suspicious state and party officials in 1945 to some of the greatest stages in the world. Picture taken January 27, 2012. To match GEORGIA-DANCE/ REUTERS/David Mdzinarishvili (GEORGIA - Tags: ENTERTAINMENT SOCIETY)

A girl (L) tiptoes to see a woman's ballot while voting in the primary election at Deerfield Town Hall in Deerfield, New Hampshire January 10, 2012. REUTERS/Eric Thayer (UNITED STATES - Tags: POLITICS ELECTIONS TPX IMAGES OF THE DAY)

A woman searches through shelves in a grocery store in Brooklyn, New York August 27, 2011. Mayor Michael Bloomberg sternly warned New Yorkers to follow the city's unprecedented mandatory evacuation orders on Saturday, saying approaching Hurricane Irene is "life-threatening" and "not a joke." Some 370,000 of the city's more than 8 million residents are under orders to leave their homes in low-lying and waterfront areas, largely in the boroughs of Brooklyn and Queens and in the financial district in downtown Manhattan. REUTERS/Brendan McDermid (UNITED STATES - Tags: DISASTER ENVIRONMENT SOCIETY)

A girl stands on tiptoes to watch athletes over a fence during a training session for the IAAF World Championships in Daegu August 26, 2011. REUTERS/Kim Kyung-Hoon (SOUTH KOREA - Tags: SPORT ATHLETICS)

An Olympics rings tattoo is seen on the right foot of Kelci Bryant of the U.S. at during the preliminary round of the women's 3m springboard diving event at the 14th FINA World Championships in Shanghai July 22, 2011. REUTERS/Carlos Barria (CHINA - Tags: SPORT DIVING AQUATICS)

Revellers parade for Unidos do Peruche samba school during Carnival in Sao Paulo March 5, 2011. REUTERS/Paulo Whitaker (BRAZIL - Tags: SOCIETY)

Ballet dancers from the English National Ballet perform during a rehearsal of "Cinderella" at the Maestranza theatre in the Andalusian capital of Seville April 6, 2010. The show will run from April 7 to 11. REUTERS/Marcelo del Pozo (SPAIN - Tags: ENTERTAINMENT)

Danielle Muir of Australia rehearses ahead of the finals of the Genee International Ballet Competition in Singapore September 12, 2009. Aspiring teenagers hoping to follow in the footsteps of illustrious dancers like Margot Fonteyn and Mikhail Baryshnikov will get their chance at stardom at this weekend's competition. The competition aims to nurture and showcase the talent of young dancers from across the globe and is being hosted by Singapore for the first time in 2009. REUTERS/Edgar Su (SINGAPORE SOCIETY IMAGES OF THE DAY)

Joffrey Ballet School student Alyssa Boysen practices in a fountain in Washington Square on a warm night in New York August 3, 2009. REUTERS/Gary Hershorn (UNITED STATES SOCIETY)

Japan's Prime Minister Taro Aso (C) walks past an honor guard upon his arrival at Beijing airport for his two-day visit to China April 29, 2009. Leaders of Japan and China will be seeking to send an upbeat economic message when they meet this week, tiptoeing around a feud over a Tokyo shrine for war dead, to focus on countering the global slump. REUTERS/Jason Lee (CHINA POLITICS MILITARY)

A paramilitary policeman stands guard in front of a Chinese and a Japanese flag at Tiananmen Square in Beijing April 29, 2009. Leaders of Japan and China will be seeking to send an upbeat economic message when they meet this week, tiptoeing around a feud over a Tokyo shrine for war dead, to focus on countering the global slump. REUTERS/Christina Hu (CHINA POLITICS MILITARY)

Japan's Prime Minister Taro Aso (C) arrives at Beijing airport for his two-day visit to China April 29, 2009. Leaders of Japan and China will be seeking to send an upbeat economic message when they meet this week, tiptoeing around a feud over a Tokyo shrine for war dead, to focus on countering the global slump. REUTERS/Jason Lee (CHINA POLITICS TRANSPORT IMAGES OF THE DAY)

A couple embraces while waiting for the subway in New York March 18, 2009. REUTERS/Lucas Jackson (UNITED STATES SOCIETY)

Ballet dancers perform Tschaikovsky's Serenade based on a choreography by George Balanchine in Budapest's State Opera March 4, 2009. REUTERS/Laszlo Balogh (HUNGARY)

Jiang Yuyuan of China competes in the women's qualification floor exercise during the artistic gymnastics competition at the Beijing 2008 Olympic Games August 10, 2008. REUTERS/Mike Blake (CHINA)

Ballet dancers stand on pointe for one minute during a record breaking attempt in Trafalgar Square in London July 6, 2008. REUTERS/Luke MacGregor (BRITAIN)

Ballet dancers stand on pointe for one minute during a record breaking attempt in Trafalgar Square in London July 6, 2008. REUTERS/Luke MacGregor (BRITAIN)

Ballet dancers stand on pointe for one minute during a record breaking attempt in Trafalgar Square in London July 6, 2008. The event formed part of Big Dance 2008, a citywide celebration of dance. REUTERS/Luke MacGregor (BRITAIN)

Polina Kyrova, dancer of Moscow's Classical Ballet company, performs during William Shakespeare's "Romeo and Juliet" dress rehearsal in Madrid April 8, 2008. REUTERS/Juan Medina (SPAIN)

Manchester United's Cristiano Ronaldo controls the ball during the Champions League quarter-final first leg soccer match against AS Roma at the Olympic stadium in Rome April 1, 2008. REUTERS/Max Rossi (ITALY)

A competitor performs during the finals of the 5th Rudolf Nureyev international ballet competition in Budapest March 8, 2008. REUTERS/Karoly Arvai (HUNGARY)

Young athletes stretch their feet as they warm up before a practice session at a diving training school in Shanghai February 14, 2008. The students from one of China's many provincial sports schools, some as young as seven, train five days a week, hoping to someday represent China in the Olympics. Even though some of these athletes might be too young to make the 2008 Beijing Games, they harbour dreams of winning Olympic gold in London 2012 or beyond. REUTERS/ Nir Elias (CHINA)

An artist performs during Cirque du Soleil's "Alegria" show in Sao Paulo February 6, 2008. The touring international cast of 55 acrobats, dancers, actors and musicians from 15 countries will perform "Alegria" in Sao Paulo from February 6 to May 4. REUTERS/Paulo Whitaker (BRAZIL)

Serbia's Ana Ivanovic celebrates winning a point during her semi-final match against Slovakia's Daniela Hantuchova at the Australian Open tennis tournament in Melbourne January 24, 2008. REUTERS/Tim Wimborne (AUSTRALIA)

The shoes of Serbia's Jelena Jankovic are seen as she serves during her semi-fnal match against Russia's Maria Sharapova at the Australian Open tennis tournament in Melbourne January 24, 2008. REUTERS/Tim Wimborne (AUSTRALIA)

Inter Milan's Esteban Cambiasso shoots and scores against Parma during their Italian Serie A soccer match at the San Siro stadium, in Milan January 20, 2008. REUTERS/Alessandro Garofalo (ITALY)

The feet of a member of the Nanjing children diving team are seen on the spring board during a training session at a sports college in Nanjing, Jiangsu province, January 13, 2008. The team has 20 diving hopefuls, aged from 5 to 9 years old kindergarten and primary school children, who receive training during their extracurricular time at this college, local media reported. Picture taken January 13, 2008. REUTERS/Sean Yong (CHINA)

Members of the Royal Ballet perform George Balanchine's ballet Jewels during a rehearsal at the Royal Opera House in London November 21, 2007. The ballet opens on November 23 and runs until December 7, 2007. REUTERS/Luke MacGregor(BRITAIN)

Christina Kim of the U.S. reacts after missing a birdie putt on the eighth hole during the first round of the ADT Championship LPGA golf tournament at the Trump International course in West Palm Beach, Florida November 15, 2007. REUTERS/Hans Deryk (UNITED STATES)

A dancer of Lviv's National Ballet performs 'Swan Lake' at the Principal theatre in the northern Spanish town of Burgos November 6. 2007. REUTERS/Felix Ordonez (SPAIN)

Presenters Kanye West (L) and 50 Cent take the stage at the 2007 MTV Video Music Awards in Las Vegas, September 9, 2007. REUTERS/Robert Galbraith (UNITED STATES)