I've been doing this routine for quite some time and although I've mastered the Cossack Squats, the mobility side of it was something else where I have to stay on Block 3 for a while. It would seem I'm getting a better hand of Twisting Squats though. I noticed is it best to start from the top, cross my legs and sit in that position to warm up the knees (in a way) to get them active from the start.