I bought the book a few years ago and have incorporated many of the KOT exercises into my routines. At one point a couple of years ago I was pretty excited about the mobility progress I was making, but honestly in retrospect I think a lot of it was just weight coming off and being in a level of shape that I hadn't been in 20+ years. I still do a lot of the exercises regularly but it is definitely not some kind of miracle routine/cure. Anatomy is anatomy and there are just some things my knees can't handle, with or without the KOT movements. Not because of the program, but just because of anatomy and general wear and tear my knees have gotten worse and I can't do a lot of the stuff I could two years ago. I had to have a scope done on the left one a few months ago and to be honest I have more pain in general in the right kneecap than I do in the one that has been cut on (twice). Still trying to get that mobility back, but I'm back to squatting with a box or bench behind me and a full sit before I stand up with the weight. Hopefully as I build more strength I can get back to a full depth squat without the crutch. TL;DR the KOT stuff, imo, is mostly engagement farming but I do believe many of exercises have merit. It's just not a miracle cure. I deleted IG but check out Jeffrey Wolf. He is a guy who I think was involved with Ben and KOT and came to the realization that it was a marketing gimmick. He preaches a lot of science-based movement from what I recall.