The Gun Counter

And the sadist of a Pilates instructor I have does an excellent job of finding them..

(Honestly, my joints feel better than they have in many years.)

yes, the support muscles scream 12-24 hours after you do a new exercise. But that is what makes the workout awesome.

I was told by a medical student thirty years ago that there were so many little muscles in the back, they don't even bother naming them.