A boy pushes a sumo wrestler out of the ring during a mock competition, at a presentation by professional sumo stables promoting the sport, at a department store in Tokyo, August 29, 2015. REUTERS/Thomas Peter

A competitor jump off the Old Bridge during the Red Bull Cliff Diving Competition in Mostar, August 15, 2015. REUTERS/Dado Ruvic

A man rides a bicycle hanging from a crane during the 6th stage of the 102nd Tour de France cycling race from Abbeville to Le Havre, France, July 9, 2015. REUTERS/Eric Gaillard

A BASE jumper leaps from the 300-metre high Kuala Lumpur Tower during the International Tower Jump in which more than 100 people take part, on a hazy day in Kuala Lumpur, Malaysia October 2, 2015. REUTERS/Olivia Harris

A dog wipes out during the Surf City Surf Dog Contest in Huntington Beach, California September 27, 2015. REUTERS/Lucy Nicholson

People take part in The Color Run in Brussels, Belgium September 6, 2015. REUTERS/Yves Herman

Bolivian wrestlers Yenny Mamani (R), nicknamed Martha "La Altena” and Leonor Cordova, nicknamed Anglea "La Simpatica", battle during a wrestling bout in Madrid, Spain, October 8, 2015. REUTERS/ Juan Medina

A participant rides a flyboard during a performance, part of a local cultural and sports festival, in the far eastern port of Vladivostok, Russia, August 7, 2015. REUTERS/Yuri Maltsev

Participants play "bubble soccer" during lunchtime on Boston Common in Boston, Massachusetts July 14, 2015. Organizers say "Bubble soccer" which is played like soccer with full contact between players wearing large air filled plastic bubbles, is a way to reduce stress during the lunch hour. REUTERS/Brian Snyder

Participant runs through mud as he competes during the Steel Character extreme race in the city of Yevpatoria, Crimea, September 26, 2015. REUTERS/Pavel Rebrov

A competitor crashes while driving his homemade vehicle without an engine on a 300-metre-track during the Red Bull Soapbox Race in Amman, Jordan September 4, 2015. REUTERS/Muhammad Hamed

A "recortador" jumps over a bull during a contest at Pamplona's bullring on the sixth day of the San Fermin festival, northern Spain, July 11, 2015. The "recortadores" dodge bulls without a cape or sword. REUTERS/Joseba Etxaburu

A member of the "Exit Point" amateur rope-jumping group jumps from a 44-metre high (144-ft) waterpipe bridge in the Siberian Taiga area outside Krasnoyarsk, September 13, 2015. REUTERS/Ilya Naymushin