OK. I'm 40 now. I am an agressive player. The kind of music I play takes alot of notes, sometimes. We play for 3-1/2 hours straight. No breaks and no stopping between songs. I am now having trouble with my hands. They are cramping and my thumbs are both locking up. I am getting worried because we are expected to do about 100 shows in 2006. Any advice? Suppliments to take??? This only started to come about within the last year. We have been playing progressively more and more each year. We also have been playing our sets like this for 3 years.