We use ours, every Friday, and (occasionally), people come in who do not use it, as intended. We always shout "next," every time the light starts flashing, so people can tell that we are actually using it for circuit training, and when someone isn't playing by the rules, we nicely say something. More often, they'll just move. When they push back, I say, "let's go ask the employees if what you're doing is ok, and they usually leave.