I used to love aerobics (well, still do, I just never go to classes anymore), especially the classes led by this one, very fit, very energetic, bouncy woman with terrific dance moves and a great sense of humour. But she'd walk around and SCREEEEAM at us to get us to work harder, and she'd "cheat" on the counting when we were doing say, sit-ups (i.e. "Eight to go! Six! Four! Four! Four! etc.). I'd be going 110 % all the time anyway, and pacing myself carefully to last for those final counts and I swear, at times I just wanted to reach up and smack her

But I digress. I'd prefer being told why doing x is wrong, and then being allowed to choose for myself. Unless I'm doing something harmful, of course, or truly don't notice what I'm doing wrong.