As a former amature body builder my advise is get into a total body exercise routine for overall strength and endurance. However,to answer your question, due to the multiple muscles required to draw a bow, lats both upper and lower, rear and outer deltoids, tricepts,forearms, finger,etc, well you get the picture by now, No one exercise is going to help alot all by itself.. What actually worked best for me at pulling HEAVY BOWS was finding a bow 15 to 20 lbs heavier than my hunting rig, and draw and hold momentarily 20 or 25 times about every 3 days, giving the muscles a rest the next day. This worked all the bow drawing muscles together... hope this helps