Convention wisdom says that fitness professionals hate sales. They’re in the training business because they are about people, want to help society, and make an impact in their clients' lives. If that’s you, if you hate sales, then you either have to figure it out, or try another career, because no business can survive very long without sales.
Some of the best sales people approach sales from a different point of view. Too often those apprehensive about selling feel as if they're "convincing" someone of something.