1. Stand with your weight evenly distributed over both feet. Hold onto the back of a chair or a wall for balance.
2. Push up to your tip toe as high as you can, then lower and back down again.
3. Do 3 sets with 10 repetitions each.
Tip: keep your weight centered on the ball of your feet.
Other exercises that are easy on the knees include biking, swimming, and water aerobics. Water exercise takes weight off painful joint and being active may also help you lose weight, which takes pressure off joints.
For favorite activities, ask your doctor or physical therapist about how to modify painful moves.