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 momentary force created when your foot returns to the ground and suddenly stops can be multiples of your own body weight. This impact can damage or wear down your knees and hips.
Constantly moving your joints without excessively loading them is actually beneficial.
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