Sprints are short running events in athletics and track and field. Races over short distances at maximum speeds are among the oldest running competitions.

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Why does cardio/aerobic exercise lead to muscle loss?

Recently, I've been reading a lot about how cardio reduces muscle mass and strength. The following is an excerpt from crossfit.com that seems to sum up what I've been reading: Aerobic training ...
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Why do sprinters have muscular arms?

I would like to know why all Olympic sprinters have muscular arms. They probably have muscular arms to help them sprint, but the reason is unclear. These are the two paradoxes I cannot fathom: Heavy ...