Bill is awesome! I have taken a class with him for a few months now, and I've also had some personal training sessions. I can see such an improvement with my endurance, strength, and flexibility already. He's great at motivating everyone to do their personal best and modifying workouts to the individual's needs. His workouts will kick your butt, but he somehow he does it in a way that is fun and lighthearted. I would recommend Bill every time!