I've heard so many different reports on what exercises are good and what aren't for string players. In "The Athletic Musician" book it is advised to NOT do weight training for upper body but a sports medicine doctor/bassist told me that that was wrong and a little weight training is important. I have the sort of muscle imbalance that is common among string players-my shoulders come forward more than they should. I've heard that repeated playing causes the muscles in the front of the shoulder to strengthen and not the back of the shoulder so that the arm in the shoulder joint gets pulled forward. I was wondering if anybody has good suggestions for this. I have resistance bands that I usually don't have time to do and dumbells (insert joke about stand partner here) but I'm trying to keep open to new ideas. Trips to the gym are hard to squeeze in.