Knees are strong in the usual movements, front to back, of running or pedaling. They are much less strong in lateral movements. I have devised a series of lateral strengthening movements with ankle weights. If my knees begin to complain, I step up these exercises. I don't claim that these exercises are the ultimate. Looking around You Tube there are dozens of exercises that do the same thing. The link shows one such exercise. Poke around You Tube and pick several you can do at home with minimal equipment and do a bit every day and good luck.