💊🔄🔙💧

#backstroke arm action #swimming technique #arm rotation #backward swim stroke #water drop

💊â†ĐïļðŸ–ïļ

#forearm pronation #arm rotation #radius ulna rotation #anatomical term #kinesiology

💊ðŸĶī🔄

#rotator cuff #shoulder rotation #joint movement #arm rotation #anatomy spin #muscle rotation