Martial Arts Torso Bullet designed to develop and improve torso group muscles. A device has three weights: heavy, extra heavy and heavy duty. The idea of Martial Torso Bullet ppractice is to include in a hand strike big and powerful torso group muscles. Short and powerful strikes, with the same speed return for a new action and defense is the key of success. In a fight, a big swing can lead to a lack of defense and a new strike delay. Go to Sizes Chart to see all device sizes.