Anyone know why I'm experiencing moderate knee pain whenever I do much walking? I walk on the treadmil about 3 times a week also using the eliptical machines and doing inclines but lately the pain just stays even if I stop the excersise for several days, it's in both knees and I do have arthritis in the neck spine hands and feet as well as osteoporosis throughout. What, if anything am I irritating doing my walking?