Mountain climbers are great for building cardio endurance, core strength and agility. You work several different muscle groups with mountain climbers- it's almost like getting a total-body workout with just one exercise.
As you perform the move, your shoulders, arms and chest work to stabilize your upper body while your core stabilizes the rest of your body.
Mountain climbers is a super versatile bodyweight exercise that can be added to your workout in a wide range of ways. Make sure to keep your position strong, with your core engaged and your hips lower than your shoulders!