The original video: Eccentric Exercise for Chronic Patellar Tendonitis / Tendinitis (Jumper's Knee)
Video with permission of:
1 set of 15 repetitions of eccentric squats (with weights in a backpack) used to treat chronic patellar tendinitis. Standing on the leg with the bad knee, exercises are done in 3 sets, once at night, after the inflammation period of tendinitis has gone away, but when pain remains. Weights are added very gradually over months. The eccentric part of the exercise occurs in the downward phase of the motion, and should ideally take 2-3 seconds; the upward motion should be relatively faster. Before doing these exercises, consult with appropriate medical professionals.