Hi, hope there isn't a thread already. I've been playing bass for about 2 years and am trying to focus on cleaning up my fretting hand technique. I can hammer on and pull off well enough, but I was mainly self taught, so I'm looking for the safest, most-comfortable, and efficient (economy of motion) way to do them. Does the movement come from your arm, your hand, or your fingers? I think I have a bad habit where I kind of twist my arm to do it sometimes. I worry about RSI's and stuff. Any help, suggestions, links or exercises would be greatly appreciated.