It is designed to improve balance, strengthen the core, and potentially slim the waistline. 
Helpful information:
It can be used for a full-body workout. 
It may help improve coordination and increase lower limb strength. 
Using a balance board can burn up to 100 calories an hour. 
It can be used in combination with other exercises. 
Some users find it helpful to hold onto a countertop or chair when first starting.