I first reviewed this fitness DVD here, but today I did the long (about 45 minutes) workout on Bob Harper's Totally Ripped Core, again. And I am now just the teensiest bit light-headed.
Gosh, Harper just makes it very clear that the common conception of abdominal crunches being ineffective only exists because every other instructor out there is a wuss. He has you do them fast, without rest, and at a variety of angles and oh my gosh does it hurt.
Also? His plank circuits are vicious enough that you're relieved when you finally get to do stand up and do insane-jumping-around cardio stuff. Only not for long, because the insane-jumping-around cardio stuff is vicious, too.
But it's so well-designed. None of the pain is injury-inducing pain, just muscles-being-pushed-to-get-stronger pain.* Love this workout.
Peace of Christ to you,
*For me. Your mileage might vary. I don't recommend it as a beginner DVD, but if you're familiar with the general rules of good form in exercise and don't have any injuries, it's just going to be a really fun challenge.