Fastforward or watch till about 20minutes in.

the bodybuilder (latrell from white chicks) is giving micheal help with his keep fit program.

micheal fails at the 2 weightlifting tasks and moves on to the treadmill, watch the treadmill closely, latrell steps on and walks the treadmill is running, latrell presses some buttons and runs and the camera pans to micheal and back to latrell who does some dances on the treadmill. The treadmill is off but latrell is running.

When micheal steps onto the treadmill and starts running the treadmill is off and ramains off for the whole of his exercise.

Now this could easily be corrected by getting some shots of the treadmill running ad then not showing the treadmill at all again.

*Remember*

Episode: Micheal joins the gym

time it takes place: between 20-25mins into the episode.