Why are some people faster than others? 2 exercise scientists explain the secrets of running speed
- Written by Dawn P. Coe, Associate Professor of Exercise Science, University of Tennessee
Jamaican sprinter Usain Bolt, in yellow, holds the world's speed record for humans.AP Photo/David J. Phillip
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Why are some people faster than others? – Jon, age 14, Macon, Georgia
Usain...


