I occassionly mix in an indo board and balance ball with my exercise routine. I think it helps with surfing and the variety always helps to keep the boredom away...since we would all rather be surfing or sitting on rear ends watching tv.
i was just about to ask about the indo board on another threasd but i have one of those balance boards you can get at any sports store and that is good enough for me. It seems like the indo board is just a basketball with plywood on top