If you want the truth, the guy seems like the bully type who would rather ridicule than try to help the gym patrons. I don't know about you but I wouldn't be motivated to go to a gym run by a jerk.
Umm.. I'm fairly certain it's a staged advertisement for the gym. You can see the grins on the nerdy guys when he's making fun of them, as well as the credits at the end give it away..