I got my new J-bass about five days ago and have been practicing five hours a day, sometimes more. I force myself to take a break every hour, and usually go through a few cycles of the yoga sun salutation. I find that some kind of body-limbering exercise is essential when I spend a good part of the day standing in exactly the same position with 20 pounds hanging from my left shoulder. (So far, I've only practiced standing up because I don't yet have a stool.) Anyone else do yoga to stay relaxed while playing? Any specific advice? Particular exercises you've found useful? I don't know the names of a lot of the poses, but I've found that the one where you interlace your fingers and stretch your arms over your head while leaning to one side is especially good.