Take a friend or a kid and two or more tennis balls. Mark one or more of them in a pattern or color and walk around your partner while he is standing. Throw the ball at him and say the color or marking out loud with this designation. If the color match the ball the partner will move out of the way and intercept the ball and continue to throw it to you with the least amount of stoppage or change in direction and if the color doesn’t match he will just move out of the way. You can do this with almost any object but tennis balls tend to leave less scarring on the face if you accidently impact hard. In a room without expensive chinaware it is also beneficial to note the bouncing about and the ricochets of the bouncing balls. Remember to keep breathing and to keep the eyes relaxed and not on the ball. Look at more than one thing at once and your coordination will relax into action better with little time.