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Jim, has the pain in your knees ever returned since you switched to stair climbing? I use a treadmill and there have been occassions where one of my knees has suffered some pain. I stay off running for some time to let the knee heel 100% before working on cardio again. I thought it was just me since I stopped playing sports years ago and figured the body, including knees, just isn't what it used to be. But Warchild's doctor's explanation about treadmills being bad/worse for knees than running on concrete seems to make sense.
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