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Originally Posted by thingstodo
Down hill is supposed to be rough on the body as well. I hear that walking down stairs is much worse than going up.
Are both of those assumptions correct?
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walking down stairs is worse on your body because there's more of a force natural force exerted back on your body from the ground. when you walk, the force going up each leg ends up having 2 - 3 times your body weight. because you strike the ground with your heel, that force travels up your bone structure and can cause knee/hip problems. so walking down stairs should cause your feet to hit with even more force than walking. but whether it's more of a force than running, i couldn't tell you.
running up hill is better for your knees because it front loads the impact and allows some of the force to be absorbed by the muscles in your leg.