Dr. Brandee Waite is director of sports medicine at UC Davis Health in Sacramento, California.
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Are Ultramarathoners Just Built Different?
Ultramarathoners can run with what seems like superhuman stamina. But are their bodies much different than the rest of ours?
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17:24
How Does Long-Distance Running Affect Your Body?
Running a marathon is a major physical feat. One expert answers listener questions about how it impacts the body and mind.