What are some intersting scientific facts about running/track?

Question

I need it for my science project. :)

Answer 1

Read this write-up on "runner's high." http://www.lehigh.edu/~dmd1/sarah.html

Answer 2

running is the healthiest sport besides swimming

Answer 3

It takes 13 seconds for oxygen to get to your muscles so sprinter do not need to breath on the 50, 60 or 100 m dashes if they don't want to. Still, it relaxes them to breath so they really need to breath after the race or their muscles will cramp up and they will collapse.

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