I posted something last year about where I noticed my playing improved and my fatigue lessened after I had been lifting weights for a couple of months. Naturally my grip got stronger from lifting and I was playing quite a bit as well so as my overall hand strength improved so did my playing. I remember this because I lift weights during the winter and then cycle during the rest of the year. Mountain biking helps with hand strength more than road biking for what it's worth.
"No Tele For you." - The Tele Nazi
Ha! Tele-ish now inbound.