My husband and I did this workout for the first time and we were begging for mercy! It definitely makes you sweat and keeps that heart rate up. The biggest negative is that it's really hard to stay on beat. I have a sense of rhythm from years of dance class and I had to count out loud in order to follow the moves. The music doesn't have a steady beat and Bob's moves are on the off beat, so it's a bit tricky. But, besides looking like a fool every once in a while, it's a great workout.