Are athletes really getting faster, better, stronger?

It's amazing how records in sports are being broken after so many years.  From when Roger Bannister broke the 4 minute mark in the mile back in 1954 to Usain Bolt breaking the world record in the 100 meter dash. Have you ever asked how this is being done? How is this possible? I know I have... check out this video from TED talks. It's an interesting insight on what's happened from back then until now. 

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