Will it last?

Beginning next Tuesday I will be taking a toning class with two of my coworkers. How long do you think I will last?? Hopefully this time around it will stick! I need to get my flabby butt into shape! A girl at work pointed out that I had, in her words, "ka dunk ka dunk" (translation: ghetto booty). They also offer personal trainers at the gym for free, so I have no excuses, other than sheer laziness.