Fashion yourself as a fitness superhero, and call yourself:
THE LARD WRANGLER
Your catchphrase can be "If you're to lazy to get out of your chair, have no fear, the Lard Wrangler is there!"
But in all seriousness, best of luck. What type of training are you planning to specialize in?
Goodlife seems to have the market cornered on the "want to lose some weight and be in shape" crowd; and those fitness bootcamps are taking a healthy bite out of the clientelle one step above that. Find yourself a niche, and excel.