question about stance drills and flexibility. obviously, the more you drill stances the stronger your legs get and the more endurance you build. for example, in clf many of us have ng lun ma to drill repetitively. however, i believe there is a limit to how much your stances can improve by just doing the stance training alone without doing specific exercises that improve flexibility, especially of the accessory muscles used. for example, one of jet li's contemporaries said that the secret to his strong empty stance was working on the achilles tendon. he said many neglect exercises that enhance the flexibility of the achilles. so my question is what exercises have you found beneficial for improving one's Dui Ma (empty stance) and Nau Ma/Tau Ma (cross legged stance)?