I have all of Jillian Michaels' DVD's (yes, that's right, I'm a hardcore fanatic). This woman never ceases to amaze me with her workouts. If you want an amazing core, this is definitely the way to go! Now I've only had the DVD for about a week now but am already seeing results. Is it hardcore? Of course it is! BUT, does it get you result? Most definitely!!! AND the best part, it only takes 30 minutes as oppose to spending countless hours wasted at the gym. Thanks Jillian! You definitely know how to motive your people and we get the results we want and deserve :o) M-F