i'm not sure if anyone else has had the same experience, but i think that my few weeks of F1 training has already noticeably improved my posture.
i wasn't really even thinking about it, but I have 5 or 6 people make comments in the past few weeks such as : "man, you really stand up straight, don't you?" "have you gotten taller?" "you have really good posture!"
i've always been a little bit sloped/rounded shoulders and slightly over-kyphotic through the thoracic, and at previous points in my life made conscious efforts to improve my posture (stand up straight, pull the shoulders back...) with little to no improvement...it just seemed impossible to maintain control continuously all day everyday...i'd pay attention for a few minutes, but would always revert to my previous poor position
i'm guessing that all of the hollow rocks, arch holds, and other mid-line strrength and mobility work has the added benefit of helping keep the entire torso/shouldersa/neck/head in more consistent, ideal alignment
so once again, thanks coach and GB!