Sounds like what I happens when I don't relax enough when I play. Not relaxing enough can make you tense areas you don't really need to and cause inflammation where the un-needed tensing is occurring. I'm also a competitive swimmer and not relaxing enough is usually the cause of swimmers shoulder bursitis. The best swimmers actually are "relaxed" even when racing full bore.
My brother's a golfer and he claims the longest shots are done when relaxed. It's not muscle tension or strain that actually makes the shots go longer. Same principles also apply to playing an instrument. You'll get a lot more out of playing an instrument "aggressively" if you can do it when relaxed. Sounds contradictory but it isn't. With too much strain you end up fighting yourself and then comes the injury.
Also look into Tai Chi. That's all about active relaxation.
My brother's a golfer and he claims the longest shots are done when relaxed. It's not muscle tension or strain that actually makes the shots go longer. Same principles also apply to playing an instrument. You'll get a lot more out of playing an instrument "aggressively" if you can do it when relaxed. Sounds contradictory but it isn't. With too much strain you end up fighting yourself and then comes the injury.
Also look into Tai Chi. That's all about active relaxation.
