So instead of doing a single drill for 30 minutes, do a drill for 15 minutes, take a break (Like by shooting a rack of 8-ball?), and then do a different drill? But since I can't fit all the drills I want to do into one day, should I do a different set of drills (Position or Cut Shots) each day? Or do one position drill, one cut shot drill, one speed control drill (etc.) each day?