I bought this 6lb. fitness ball for my wife, and find myself using it, more than her! We tend to fight over it, because it's so much fun to work-out with! It's easy to use, portable, easy to store, easy to travel with, provides a great work-out that you can FEEL; and comes with an instructional DVD, that also provides more uses and exercises to do, with the ball. It's a fun, excellent, work-out tool!