Swimmers in fancy dress hold up placards as they participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Swimmers in fancy dress pose for a photograph as they participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

A swimmer with his face painted as the flag of Scotland, reacts as he sits in the water during the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Swimmers in fancy dress participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Swimmers in fancy dress take to the water to participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Swimmers in fancy dress wear masks depicting members of Britain's Royal family (L-R), Prince William, Catherine, Duchess of Cambridge, The Queen and Prince Philip, as they participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY ROYALS ENTERTAINMENT) 

Swimmers in fancy dress hold up placards as they participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Swimmers in fancy dress participate in the New Year's Day Looney Dook swim at South Queensferry in Scotland January 1, 2013. REUTERS/David Moir (BRITAIN - Tags: ANNIVERSARY SOCIETY) 

Olympic swimming champion Michael Phelps from the U.S. watches his shot from the rough at the 10th hole during the second round of the Dunhill Links golf championship in Kingsbarns near St Andrews, Scotland October 5, 2012. REUTERS/David Moir (BRITAIN - Tags: SPORT GOLF SWIMMING) 

Britain's Prime Minister David Cameron speaks to paralympic swimmer Ellie Simmonds as they arrive to attend a reception for British Olympic and Paralympic athletes in London September 10, 2012. Tens of thousands of Britons took to the streets of London on Monday to cheer Olympic and Paralympic athletes, celebrating a summer of spectacular sport that surprised even the most optimistic by lifting the host nation's mood. REUTERS/Neil Hall (BRITAIN - Tags: SPORT ATHLETICS SOCIETY OLYMPICS) 

Britain's Prime Minister David Cameron (C) cheers as he watches Team GB swimmer Elleanor Simmonds win gold in the women's 200m Individual Medley - SM6 race in a world record time, during the London 2012 Paralympic Games at the Aquatics Centre in the Olympic Park September 3, 2012. The SM6 category is for swimmers with short stature, amputations of both arms or moderate co-ordination problems. REUTERS/Stefan Rousseau/pool (BRITAIN - Tags: SPORT OLYMPICS POLITICS) 

Britain's Prime Minister David Cameron attends the swimming competition to watch Britain's athletes during the London 2012 Paralympic Games at the Aquatics Centre in the Olympic Park September 3, 2012. The SM6 category is for swimmers with short stature, amputations of both arms or moderate co-ordination problems. REUTERS/Luke MacGregor (BRITAIN - Tags: SPORT OLYMPICS SWIMMING) 

Britain's Prime Minister David Cameron attends the swimming competition to watch Britain's athletes during the London 2012 Paralympic Games at the Aquatics Centre in the Olympic Park September 3, 2012. The SM6 category is for swimmers with short stature, amputations of both arms or moderate co-ordination problems. REUTERS/Luke MacGregor (BRITAIN - Tags: SPORT SWIMMING OLYMPICS) 

A combination picture shows different athletes sticking their tongues out during the London 2012 Olympic Games. Athletes shown are, top row (L to R) tennis player John Isner from U.S., weightlifter Natasha Perdue of Great Britain, weightlifter Meline Daluzyan of Armenia. Middle row (L to R) hurdler David Greene of Great Britain, double trap shooter Peter Robert Russell Wilson of Great Britain, swimmer Michael Phelps of U.S. Bottom row (L to R) shot putter Pavel Lyzhyn of Belarus, weightlifter Junior Sanchez Rivero of Venezuela, weightlifter Deni Deni of Indonesia. Pictures taken on various dates since the start of the Games. REUTERS/Staff (BRITAIN - Tags: OLYMPICS TPX IMAGES OF THE DAY)

Michael Phelps of the U.S. is reflected as he swims his men's 100m butterfly semi-final during the London 2012 Olympic Games at the Aquatics Centre August 2, 2012. Phelps qualified for the final in first place. Phelps became the first male swimmer to win the same event at three successive Olympics when he clinched the men's 200 metres individual medley gold medal at the London Games on Thursday. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING TPX IMAGES OF THE DAY)

Michael Phelps of the U.S. swims to win gold in the men's 200m individual medley final during the London 2012 Olympic Games at the Aquatics Centre August 2, 2012. Phelps became the first male swimmer to win the same event at three successive Olympics when he clinched the men's 200 metres individual medley gold medal at the London Games on Thursday. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

(L-R) Missy Franklin, Dana Vollmer, Shannon Vreeland and Allison Schmitt of the U.S. receive their gold medals from former Olympic swimmer Alexander Popov, who is currently a member of the International Olympic Committee (IOC), on the podium after winning the women's 4x200m freestyle relay final with an Olympic record during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Dana Vollmer (L) and Missy Franklin of the U.S. cheer on anchor swimmer Allison Schmitt as they win the women's 4x200m freestyle relay during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

(L-R) Shannon Vreeland, Dana Vollmer and Missy Franklin of the U.S. cheer as anchor swimmer Allison Schmitt (not pictured) of the U.S. swims the final leg of the women's 4x200m freestyle relay final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. The U.S. won the women's 4x200 metres freestyle gold medal at the London Olympics on Wednesday after a brilliant anchor leg from Schmitt. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING) 

Shannon Vreeland (L), Dana Vollmer (C) and Missy Franklin of the U.S. cheer on anchor swimmer Allison Schmitt as they win the women's 4x200m freestyle relay final during the London 2012 Olympic Games at the Aquatics Centre August 1, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps (L) of the U.S. stretches next to gold medallist Chad le Clos of South Africa at the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps of the U.S. walks to the podium for the men's 200m butterfly victory ceremony during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps of the U.S. (L) claps as South Africa's Chad le Clos waits to receive his gold medal on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Gold medallist Chad le Clos (R) of South Africa poses with silver medallist Michael Phelps of the U.S. on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps (L) of the U.S. and gold medallist Chad le Clos of South Africa stand on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps (L) of the U.S. shakes hands with gold medallist Chad le Clos of South Africa on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Michael Phelps of the U.S. stretches his neck on the podium with his silver medal during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Michael Phelps of the U.S. stands at the podium before receiving his silver medal during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Gold medallist Chad le Clos (C) of South Africa poses with silver medallist Michael Phelps of the U.S. and bronze medallist Takeshi Matsuda (R) of Japan on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Michael Phelps of the U.S. receives his silver medal on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Michael Phelps of the U.S. poses with his silver medal on the podium during the men's 200m butterfly victory ceremony at the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Silver medallist Michael Phelps (L) of the U.S. and gold medallist Chad le Clos of South Africa walks to the podium for the men's 200m butterfly victory ceremony during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Michael Phelps (L) of the U.S. swims with Chad le Clos of South Africa during their men's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING TPX IMAGES OF THE DAY)

Michael Phelps of the U.S. leaves the pool deck after winning the silver medal in the men's 200m butterfly final during the London 2012 Olympic Games at the Aquatics Centre July 31, 2012. Phelps, who was bidding to became the first male swimmer to win the same individual event at three Olympics, led all the way but messed up his touch, allowing South Africa's Chad le Clos to get his hands on the wall first. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Nathan Adrian, Michael Phelps, Cullen Jones and Ryan Lochte of the U.S. stand with their silver medals in the men's 4x100m freestyle relay victory ceremony during the London 2012 Olympic Games at the Aquatics Centre July 29, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING TPX IMAGES OF THE DAY) 

Michael Phelps of the U.S. looks down at the pool after his team was beaten to the gold by France in the men's 4x100m freestyle relay final during the London 2012 Olympic Games at the Aquatics Centre July 29, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING TPX IMAGES OF THE DAY) 

Swimmers perform their turns during their women's 400m freestyle heats at the London 2012 Olympic Games at the Aquatics Centre July 29, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A Canadian swimmer practices his starts during training at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer from France uses her mobile phone after training at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer from France prepares to train at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Italy's Federica Pellegrini (R) and Filippo Magnini kiss after training at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING) 

A Canadian swimmer stretches at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A Canadian swimmer trains at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Italy's Federica Pellegrini (R) prepares to train with other Italian swimmers at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A South African swimmer stretches after training at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Australian swimmers arrive for training with a coach at the main pool at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 26, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer rests during a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

A swimmer attends a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING) 

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

Swimmers attend a training session at the main pool of the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)

A swimmer is seen in the pool during a training session at the Aquatics Centre before the start of the London 2012 Olympic Games in London July 25, 2012. REUTERS/David Gray (BRITAIN - Tags: SPORT OLYMPICS SWIMMING)