5. Break up your sets.
Instead of performing 2 or 3 sets of a single exercise before moving to the next one, do a circuit: Complete just 1 set and then immediately move to the next exercise, repeating the circuit 2 or 3 times. When researchers had testers do either standard strength-training (3 sets of 6 exercises with 2 minutes of rest in between) or circuit-training (moving through a series of 6 exercises 3 times, with 30 seconds of rest in between), the circuit-trainers burned nearly twice as many calories postworkout as the standard-style lifters. “Because your heart rate stays elevated longer after circuit-training, you continue burning fat as though you were still exercising,” says researcher Anthony Caterisano.