for the basketball and hockey arguments you made...i'm fairly certain things like stimulants can be and are used to help maintain focus during practice. 3 point shooting is a boring mechanical repetitive motion. Doing that motion 1000 times a day is boring. Taking a stim might allow you to continue to focus and get the reps in that will allow you to perform the motion better. Taking the right drugs might allow you to avoid injury and reduce fatigue.