That sucks about New Years eve. I'd really consider your other employment options -- retail and food service are bitches when it comes to schedules. I'd look for some sort of web design job, one where perhaps you can set your own hours, and get something more along the lines of $10-12 an hour steady.

As for the personal trainer thing -- yeah! Do it. Sounds like something right up your ally. You'd be giving me tips then, and not vice versa.