New member here. 63 y/o endurance athlete (backcountry skiing and ultramarathon running) has always been stiff. I’ve been doing all the GFM exercises for a week now, some better than others but I don’t fail at anything until the last part of the Bone Saw video, sitting cross-legged. In every yoga class I’ve ever taken this is where I simply tip over. I’m not sure what kind of rotationI am missing. When I try to cross one leg over the other bent leg sitting on the floor, there is no way it’s going that direction at all. The angle I put my leg at doesn’t matter. Even high, my foot cannot cross over the other leg. If I try to pull it there, I tip over backwards. The only thing that hurts when I do this is my knees, seemingly on the LCLs or the ITB. Nowhere else do I feel anything, just no ROM and pain on the lateral side of the knee of the leg I’m trying to cross over. I think it’s external rotation of the hip but I don’t have any trouble doing those movements that preceded this. What is the deficiency in my mobility that causes this move — that everybody else seems to be able to do — to kill my knees and has done so my entire life? I think this is possibly the key to all my mobility problems.