4. Stretch
Regular stretches can help a lot, depending on the cause of the knee pain, which part of the knee is affected, and which stretches you use. For pain behind the knee, for instance, try stretching your hamstrings and glutes. Good ways to do this include trying to touch your toes, or trying to lift your leg straight up while you’re lying flat on your back. Restoring flexibility can make a big difference.
And once again, the best way to get these exercises that will stand the best chance of fixing the problem is to see a professional who diagnoses these kinds of treatments for a living!