Hi Karen - I have the Bender Ball. I like the idea of the ball to support my lower back and the DVD's are OK, but are very short (which is what you might be looking for). I use it for a lot of my ab work, but do my own exercises a lot of the time. I have to admit I haven't done the DVD's for an extended time so I can't comment on the results that you would get, but I like it just as a new exercise gadget for my workout room. :7
Marcia.