Cathy:
Before I got certified I was involved in youth sports, coaching soccer and basketball. Even if coaching a specific sport weren't your cup of tea, working with kids is so non-intimidating that I know it helped me get used to how to teach a lot of things about general fitness, not just as it pertained to training for the sport. There are probably some sports programs in your area that would love to use a trainer to come out and show their teams how to stretch, warm up, incorporate strength-training and maximize time spent on cardio activities. There are lots of mom and pop volunteer coaches who would really love to tap into your expertise, plus it's a great way to utilize word-of-mouth advertising. All those kids you work with are going to go home and tell their parents about the cool lady who came to practice and taught them how to do......
Good luck.
--Ann