Runners will have a higher bone density than swimmers because their whole body weight is always acting on the skeleton for the duration of that activity, but during swimming half of the swimmers weight is not acting on the skeleton for the duration of that activity, signaling the body that it does not have to rebuild the bone as much. Runners: higher bone density Swimmers: lower bone density
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The swimmer, because there is infinite gravity in water. Have a lovely life in your crack house.