Anyone work in the Sales Department at a GYM? Advice?

[praise the x i]

Anyone work at 24, Club Sport, Ballys etc as a Sales rep selling Memberships? I have an interview and I KNOW I would be perfect for this job and it would suckif I don't get it. I always joke around and act a fool with the managers so when I go in I am hoping they see me as a person of business and not who I amwhen I go to the gym. If I land this I will leave my job that I just got hired for considering they haven't called me for training yet and you have to jointhe union to work there. Any experiences doing sales? How was the $$$?