Ok guys I have been a Trainer before for 2 Local ( 5+ Location's) Gyms. I as a Trainer with 1 of these gyms was REQUIRED to go through Bosu Ball and core type training the first 3 sessions. I hated the crap out of it however if we did not do it we were written up and possibly lost our job. Before you judge you need to know the policies laid out by the CLUB for these guys...
This is why I will NEVER go back into Training unless I make the rules and don't have some California Surfer "expert" on fitness tell me what to do with a client the first few sessions. Ok rant over....