Aw geez, I used to be able to chicken-wing my arm behind my back and roll my back muscles over my knuckles to loosen them up,...
Aw geez, I used to be able to chicken-wing my arm behind my back and roll my back muscles over my knuckles to loosen them up, now it’s just beyond me and they’re getting really knotted up
Oh yeah, got one of these things

, they’re great.