OSIM uSurf Wave-Action Exerciser With 3 levels of speed, low, medium, and high, you can customize your workout. The board moves up and down, side to side, back and forth. This movement, simulating that of a surfboard, helps strengthen core and leg muscles while improving your balance and reflexes. And with the attached balancing ropes, you don't have to worry about falling off. These ropes can also be used to give your arms a resistance workout. When you get on the uSurf, you'll find that it is very easy to use, but despite the simplicity, you are getting a good workout, and soon you will be able to feel it in your legs and abs. Includes workout dvd.Google Brookstone OSIM usurf