This door speed bags for boxing is a sleek, fitness-boosting piece of equipment. Use it to enhance your upper body strength, quick reflexes, accuracy, coordination, and endurance. The wall mounted system allows height adjustment, so with a training buddy or in shoes that lift you higher, the ball can adapt to fine-tunable perfection. This Soozier boxing training equipment makes a great performance tool for MMA, martial arts, and more. Use it to get in shape with amateur or professional practice.