After leading more than 12,000 personal-training sessions, Dr. Kevin Plummer has yet to get bored. That's because every one of his workouts is customized to the client—and his client base tends to be quite diverse. He's developed routines for new moms, competitive athletes, brides-to-be, and people looking to lose weight, as well as those who simply want to get toned.

His programs cover workouts that consist of a warmup, planned exercises, and interval training or flexibility work, all conducted in a private or semi-private setting. Dr. Plummer also provides insights on nutrition and stress management, monitoring each client's progress with regular fitness reports.