There are multiple benefits and uses of balance boards.  And they are not just for adults.  SmartGamesAndToys offers a balance board for kids!  

Look here for a variety of fun activities to encourage your child with...

1.)  Begin standing on board and attempt to balance with an upright posture.  This enhances balancing skills and motor skills.

2.)  While standing and balancing on board have your child keep their arms at their side and see what a difference that makes.  Works building stabilizing muscles in back and legs.

3.)  Have your child close their eyes while balancing.  This works equilibrium and coordination in getting from point A to point B.

4.)  Have your child create a contest with friends to see who can stay on the board longest.  This promotes teamwork and fun group play.