6. Kettlebell circuit
The burn: 554-822 calories/hour
The bonus burn: Tamir says that a HIIT circuit using kettlebells can keep the afterburn going for 36 hours after you leave the gym. To get the best results, make sure you’re doing a fluid circuit and not stopping to rest between each move. Tamir recommends switching between upper- and lower-body movements so you can keep exercising for a longer period of time. Try doing a set of kettlebell swings, kettlebell squats, and kettlebell push presses. Then, rest for 15 to 20 seconds after completing the three moves.
(Or pick and choose some other moves from the best kettlebell exercises.)