Search results for sports-and-balance-trainers are below:

http://whirly-board.com/

The concept of the Whirly Board was created with the intent of providing an enjoyable and challenging tool for learning and practicing skills that will translate directly to all board sports. Skills developed on this board will improve the user’s center of balance, board control, and agility. The Whirly Board also teaches proper mechanics of initiating and completing rotational tricks while gaining comfort and spatial awareness throughout the spin. -Whirly Board