The high jump method of jumping head first and landing on the back is called the Fosbury Flop.
Gymnasiums were introduced in 900BC and Greek athletes practised in the nude to the accompaniment of music. They also performed naked at the Olympic Games.
About 42,000 tennis balls are used in the plus-minus 650 matches in the Wimbledon Championship.
Sports command the biggest television audiences, led by the summer Olympics, World Cup Football and Formula One racing.