The Speedball is very flexible and can improve your stamina, speed and accuracy. Strengthen your body. Also helps to develop your reflexes Increase your speed and improve your hand-eye coordination. Suitable for mixed martial arts, fighting, boxing or everyday reaction training, precision, agility, endurance and more. The double-headed airbag, airtight nozzle, double-headed rubber airbag inside the ball can be easily inflated with an air pump and the double-headed airbag can be easily inflated and deflated with an air pump and can be stored when not in use. The speedball in boxing, training on the boxing ball not only builds endurance and strength, but also improves reflexes and reflexes. Specially designed for MMA, boxing, fighting and other boxing training and used professionally in the gym and at Used at home to improve your flexibility, coordination, accuracy and reflexes.