Originally Posted by
deapee
It's not nonsense. Adding load to your knees (not a muscle, cannot adapt and grow stronger) is NOT good for them. He didn't say it's definitely bad for them, just that it's not good for them.
Tendons, tendon sheaths, and attachment points all adapt. Conditioning is not only about muscles. Thus most weights programs include a starting period where one lifts relatively light and higher reps. Then gradually, reps are reduced and weight increased. This allows time for the relatively long adaptation period required by connective tissue. Muscle adapts much more quickly.
Historically on this forum, several have found that the solution to their tendinitis/tendinosis was simply working up to lifting heavy at low reps. Works for me too.