Features: - The harder to hit the ball, the faster it comes back. - The ball consists of a rubber ball connection to the intro of an elastic string. - You can use it as boxing punching speed quick response training accessory. - It can help train your reaction, agility, punching speed, fight skill and hand eye coordination while providing an interesting workout. - Perfect for work breaks or school breaks or even for the beach and the park, this focus punching ball will burn many calories and help you get fit.