not saying that gymnist are not strong, because i know it takes strength to preform as they do, but i did not give yoga it due credit until i tried it.... have you ever tried yoga?? may move as a gymnist would do, but they move slower and hold poses at the hardest time, using felxibility, metal strength, SINGLE muscle control, and the sretching and breathing you talked about.
i think you should try this, do 10 pushups fast and clap at the top. then try to do 10 push ups in ten minutes taking 1 minute on each push up, moving real slow... if you do you will see what i am talking about. both take strength but one takes more focus and muscle control to do
YouTube - Duncan Wong Yogic Arts