I'll admit it, I quit easily, I don't enjoy exercising and yet this exercise dvd is difficult but not so difficult that I give up and end up on my couch. It's a challenge and yet doesn't discourage me. Bob provides a lot of alternate moves if you're not as flexible or as in shape. Speaking of Bob, he's so encouraging. I realize he's just talking to a camera but I still find his words encouraging and I feel great after my workout.