Hi Master, well I have had a couple knee issues in my time....and at one point I couldn't use weights to strengthen my knees... there was one exercise that did help my knees get alot stronger... Well first you need a bouncy ball, then find yourself a completely flat wall...stand so your back is against the wall with the bouncy ball between your back and the wall...with your feet about shoulder widths apart and your back resting on the bouncy ball squat slowly bending only at the knees...the bouncy ball should be rolling up your back and along the wall as your squating from your knees...this exercise will definitely strengthen your knees aswell as your thighs, gluets, hamstring, calves, and core...its a very easy exercise... I hope you understand what type of exercise I'm trying to describe in this thread... Cruiser