Get ready to burn fat and build muscle with circuit training. This workout combines cardiovascular exercise with weight training. By combining moves that increase the heart rate with strength training exercises, the result is a workout that burns calories and builds muscle.

Equipment Needed: Two to four sets of dumbbells of varying weight; chair; Interval Timer

What To Do For This Workout: Complete each exercise for the recommended number of repetitions. Move to the next exercise without resting. Rest 30 seconds after each completed circuit. Complete the number of circuits listed for your fitness level. Increase the weight with each circuit.