Circuit training is the best way to slim down and build muscles at the same time. By kicking up your heart rate and having more muscle on your body, you can enjoy what you eat and still control your weight Here are a variety of circuit training programs designed to get every part of your body in terrific shape: Cardio Circuits: are fun and motivating ways to boost your energy and burn up fat. Strength Training Circuits: Firm and build more muscle so your body eats up calories around the clock. You’ll train your upper body with weights and sculpt your lower body without weights for a lean, well-defined look. With all these different circuits to choose from, you’ll zero in on what your body needs have workouts that fit your schedule and never get bored.