Bob Harper

I have the first four (Pure Burn, Super Strength; Cardio Conditioning; Yoga for the Warrior; and Bob's Workout). They. are. tough. GOOD, but tough. I absolutely LOVE his yoga DVD. I try to fit that in once a week -- it's wonderful.

Haven't tried his kettlebell DVDs yet, but I'd like to get them eventually.

I've been doing the Pure Burn Strength training and really like it. My hubby and I had been doing the elliptical and bike for months and needed to add strength training. My hubby was looking at P90x because it looked like it would give him a challenge. But I'm not the most athletic or fit so I scares me, hehehe! But a friend recommended Pure Burn and boy does it kick both our butts. I can actually keep up with it, for the most part. It's challenging, but not to the point where I want to give up. And I can see where if I do it long enough, eventually I can get as good as the crew on the video and not have to stop and catch my breath as much. The reviews on amazon show that some people who do P90x like it and it challenges them, so I feel pretty good about being able to keep up with it. I burn around 500 kcals doing the 1 hr video. Been doing it twice a week for a bout two weeks, so far so good! maybe one day I'll do P90x...maybe!