Bests & Worsts Reviews from Amazon

You wouldn't think simply twisting on this would feel like a workout. But boy does it! You're not just twisting, you're moving your whole body, if you're doing it right. Plus balancing which uses your core more than you think. Also includes a DVD that has different ways to use the board to get the most out of your workout. I admit I haven't tried the other ways YET, but I'm a beginner, so I'll work up to them. Recommend time is 15mins. per day. Doesn't seem like a lot, but to THIS beginner, I can really tell I've gotten a workout.