The science that goes on in athlete's bodies is pretty neat. Athletes push their bodies for miles and deal with cramping, dehydration and every runner's worst fear: that extreme form of fatigue called "hitting the wall." Why is endurance running so difficult? Reactions runs through the science of distance running: why muscles burn, how sweat cools the body and the chemistry of runner's high.
Season 3 Episode 45
Length 04:23
Premiere: 11/03/16
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