"Outcome is important to the ego, process is important to awakening"
Over the years I have heard some disparaging stories about Ashtanga yoga because of the intensity of the practice and the many stories of injuries. Part of the problem is that people with gifted bodies become teachers very quickly, not necessarily acquiring the intrinsic knowledge that is essential in a truly qualified teacher. It is easy to miss the forest for the trees as the body becomes impressively developed. Physically gifted neophytes are often more vulnerable to the ego running the program, whereas older, more experienced teachers have been humbled by time and practice.