I saw a mention of this on here a couple weeks ago. I'd always heard the "never let your knees go past your toes" advice. And my knees always hurt if I run, jump, hike downhill a lot..... I just figured I'm 55, and that's the way it is now. But maybe not. I looked up KOTG on YouTube and watched several videos. Subscribed to his program, bought a couple Rogue sleds (for my son and I), a tib bar, a pair of Monkey Feet, and we've been adding a lot of KOTG stuff to our training. We're doing a couple days of full body weight lifting (squat, lunge, hinge, push, pull, and carry movements), a couple days of MtnTough HP20, and a day of arms, shoulders, calves. Just a few days of the KOTG stuff has my knees feeling better. I haven't ran, so that'll be the test. I bought a Rogue Echo bike to "run" on (standing) in the HP20 workouts. After a couple more weeks of KOTG, I'll run instead of bike to see if there's any progress on my knees.