#2 – Swimming
This is among the best exercises for people with bad knees. When you are swimming, the gravity’s impact is out of the equation giving you lesser chances of damage to your painful joint.
In the pool, you can do a few laps to strengthen your knees. Actually all swimming styles are beneficial for knees, but it is possible that a certain style can hurt your knees, so that must be avoided. An average of 20 minutes of swimming should be enough.