18 Great Cardio Workouts That Don't Require Running

Want a bigger challenge than dumbbells or kettlebells? Wilke and Gallagher of Throwback Fitness change up their routines by incorporating medicine balls into their workouts. Try completing 10 rounds of the following circuit as fast as possible.

Workout:

• 10 overhead lunges: Hold the med ball overhead. Perform five reps on each leg.
• 15 thrusters: Holding a med ball at the top of your chest, drop down into a squat, then explode upwards, pushing the ball toward the ceiling.
• 20 medicine ball sit-ups: Hold the ball against your chest for the sit-up.