I am wondering why elliptical and bike are considered to be low impact and better for people with bad knees. To me, these two seem to be using the knee joints more? Compared to walking or running on a treadmill
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The woman “running” next to me on the treadmill today sounded like she was trying to slam her entire leg through the crust of the earth with each footfall. She was not a large woman either, just had the running form of a person who believes their entire body must leave the planet and come down with 3x the force of gravity in order to produce propulsion. I cannot fathom the impact that was having on her legs.
Oh ELI5 – if your body leaves the ground and comes back down there is impact, if it is just moving without leaving the surface of the earth, there is little/no impact. There are still forces being produced, but they are friction and rotational force.
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