Fitness bootcamp classes are structured, full-body workouts that combine cardio and strength training in one session. Considered a form of high-intensity interval training (HIIT), these exercises are often done as a circuit, where you’ll quickly move from one station to the next. Other times, you’ll alternate between two exercises (squats, say, and then push-ups or planks on the floor).

Bootcamp workouts use a combination of weights and bodyweight exercises, allowing you to build muscle while burning fat.