I recently went to a martial arts class with someone considered to be a master instructor and beloved teacher. But it seems that in the internal martial art of Ba Gua Zhang, there is the Gokhale-friendly notion of loosening up the hips, but also a lot of pelvic tucking as part of the training.
1) Is there a safe way to practice this martial art? Is there something about the rest of what they are doing that makes it safe to hold the pelvis in such a position?
2) If not, what is the general strategy for modifying the body mechanics of a discipline which is highly traditional and in which teachers' beliefs are there to be learned, not questioned? Is there any polite way to keep practicing this while protecting L5-S1?