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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It is literally less impact. On a treadmill your feet are constantly hitting/impacting a surface which can be jarring to your joints. On an elliptical or bike your feet are not impacting anything, but smoothly pushing the skis or pedals.
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