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Does the secret of Usain Bolt's running success lie with the fact that Jamaicans have symmetrical knees?

Perfectly formed: Scientists say the secret of Usain Bolt's success might be his symmetrical knees

Scientists may have hit on the secret behind Usain Bolt’s success on the track – his perfect knees.
A study of Jamaican youngsters found those whose legs, and particularly knees, match in size grow up to be the best sprinters.
The finding could help explain why athletes from the Caribbean island dominate international 100m and 200m races – the distances Bolt specialises in.
The theory may seem bizarre, but many scientists believe perfectly paired body parts are a sign of good genes and good health. 

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