Bad habits I need to break

[mdlbear]

For years I've been in the habit of putting my elbows up on things like chair backs, the car's window-ledge, and so on. Lately I've noticed that it sometimes causes a little pain around the shoulder, armpit, and upper arm, especially on the left side (probably because I do it a lot while driving). Since pain in the left arm is also a symptom of a heart attack, and since it's annoyingly in any case, I'm trying to keep my elbows down.