The other day I asked my husband's cousin about this. She's nearly 50 and sings in a rock band. She suggested that perhaps the playing 3 30-minute sets with an hour in between may cause an adrenaline up-and-down, which can make you feel really whipped. Cause at 30 minutes, you're just getting warmed up good, then you STOP. And I thought about it... I have played 3 hours at a stretch, and felt fine. So maybe there's something to that.

Guest Frank, I tried that vegetarian thing once, and it absolutely did not work for me. I have adjusted my eating habits, though, and I do pay pretty close attention to things like saturated fat and too many sweets. So you're right when you say diet is important; I just think each person needs to find what's the right diet for them. You're also right about the not drinking or staying up late thing. :-)

I do Tae Bo (and belly dancing!) and have found that it has improved my breathing, of all things.