Has anyone here ever used a powerball to prevent or treat guitar-related injuries such as RSI and carpal tunnel? Or do any of you guys use it to warm up? I have one lying around and I wanna know if it's a good idea to use it!
Washburn X50 PROFE
Dean Custom 450
Morley PWA Pro Series Wah
Big Muff Rams head
Zoom G2
Ibanez Phase Tone
Randall RG75 G3

Tales of Ale: http://www.talesofale.com
I'm at music college, and a guy in my class has developed tendonitis, so his doctor actually reccommended using it to warm up

Don't know if that helps....