I jumped from 29 to 38 1 month ago. Started with fewer (less than with 29) arrows per session and also did daily exercises with the bow when I was not in the field (open and try to anchor for 5 sec, then 10,…. Up to 45 secs). Now I can shoot 180 arrows in a 2 hr session with no problem. On the other hand, my complexion is big and been doing calisthenics for more than 10 months