I don't see the relationship of long legs and sore biceps. If you are further from your drums, you are stretching your arms out more and using more tricep than bicep. If you are keeping your arms bent at the elbow ( playing something too close to play with extended arms) than you are using your biceps.

jazz does not make you immune to physical issues, just as playing heavy metal doesnt make physical issues inevitable.  

decent technique and care make you immune.  not having decent technique or taking care makes it inevitable.

and didnt rich have back problems? i dont get it ... didnt he play jazz?  

I know exactly what you're sayin!!  I'm 5' 1".......

And BTW just wanted to add that Mick Fleetwood rocks....

I'm 40, my body is 50 and most likely because i refused to grow up. Physically and mentally from 17