I just got this sequence from a point of view of the shoulders and it is fantastic. You helped me 'find' my shoulder stabilizers for external (arms in front of body)and external (spiraling the arm out and open, with the mermaid). Wow! So helpful for me. Regarding the leg work while supine: I note that if when the leg is extending, if I coordinate the glutes with the lower abdominals it finally begins to release the 'tightness' in my hip flexors, in the front of the hip; the gripping releases. Is this ok, to engage the glutes at that time? Thanks so much for even considering my query!