that being said, here are things i will let people work in on:
bench (hey, it gets me a free spotter) but flat only, i do ok on incline
anything cable where they're using the same attachment
most machines
pretty much anything involving calves
things i absolutely REFUSE to let people work in on:
squats- even if they just want the rack and don't plan on touching the bar
actually, come to think of it, anything legs
anything back, except for chins and cable rows provided they're doing chins or cable rows
most delt stuff; i like to move fast
and by all means I'M NOT SHARING THE DBs SO QUIT ASKING
i'm done