When you first begin balance training, you should practice on a stable surface. Once that becomes easy, you’ll want an additional challenge. Both Bosu balls and wobble boards provide an unstable surface that challenges balance and helps develop functional strength, coordination and core stability. In both cases, you must learn how to keep your center of gravity balanced over your base of support. However, there are some differences in the types of training you can do on a Bosu ball and a wobble board.