I found doing 3 miles a day on my recumbent bike, I'm 71 yr.old female, has given me back pain free knees. I have torn meniscus and osteoarthritis in both knees, which, among other things, made getting up from the table painful but no longer. Also, I do 5 different repetitions with 5 lb. weights for upper body strength which strangely is strengthening my core muscles. I hope this was helpful...good luck !