Most CrossFitters out there may disagree with the statement that double unders are as easy as air squats. But think about it for a minute. Double unders do not require a tremendous amount of strength. One only needs to hold 4 ounce handles in their hands and rotate a 3 ounce jump rope around their body. One doesn’t need a tremendous amount of explosiveness. They only need to get off the ground 3 or 4 inches.