Agile AL series.

[lreese]

I'm sorry but people who get back injuries from just playing a heavy guitar need to work out their core and back muscles more. Not to mention working on posture. /rantover

Didn't mention from just playing guitar - Flannel is still young and strong (and by some accounts a sexy beast, but I'm not qualified to judge that. :p).

Chances are you'll have an event from something (God forbid). Life happens.

Mine was from a hard to start lawnmower. Could hardly walk for a few days. Never the same again. I work out pretty religiously...