I have a question for the guys that say you have all the strength you need and that what you need is dexterity. My buddy showed me and exersise from a guitar work out. (I think it was Steve Vai but I can't remember) but anyways the exercise is for endurance. What you do is hammer on with your index finger for a minute, then your middle finger then your ring then you pinky and then every day you make the time a little longer to build endurance. Thing is this exercise makes my forearm burn like it would when i'm doing a forearm exercise while strenght training. Does this mean its a bad exercise and something I shouldn't be doing?