Roger Gracie Mastering the Mount, Vol 1: Concepts & Control
Roger Gracie on holding mount: two escapes that matter, the soles-glued rule, the cross-feet rest, and the foot-push climb to high mount for the finish. The climb to high mount sets up both the choke and the on-top armlock, which Roger runs instead of falling back flat.
This public BJJ flow maps techniques and transitions.