I jump, shake my guitar around, point at people, hold my guitar up next to me (actually helps me with part of a solo!), go up to my bandmates, shoulder shrug, and I've done short instances of "The running man" for kicks. This is in Arkham Dispatch - I'd be a bit more limited in Slugeater. Your music better absolutely amazing if you're not going to move . Most bands don't have music so powerful that they can stand still.