With locations in more than 20 states, it’s safe to say Fitness 19’s approach to fitness has piqued exercisers’ interest. Gyms house Life Fitness, Precor, Concept 2, and other cardio machines as well as Life Fitness and Hammer Strength strength-training equipment. For aerobic enthusiasts, classes such as Zumba, yoga, spinning, bootcamp, Group X help tone muscles and burn fat. What's more, the staff of nationally accredited certified personal trainers oversee one-on-one workouts and small group training sessions to help members meet their fitness goals. There's even a supervised kids club for children under 12.