Whether you're trying to bulk up or cut fat, cardio workouts improve aerobic and muscular endurance, and make your abs pop.

Since professional athletes, CrossFitters, and fitness models often share their go-to cardio routines with Men's Fitness and mention their favorite devices, we compiled a list of tried-and-true machines for burning calories and boosting performance in the gym. Find local facilities that have these innovative pieces of equipment or train to the max at home. The power to uncover your six-pack is in your hands.