I am just starting it so I don't have a lot of insight yet. Today I did workout 1a and it was a metabolic circuit style workout - you do five exercises (some strength, some cardio) and you run through the circuit four times. The workouts are all around 17 minutes long, but you need to do your own cool down. I also like more of a warm-up and I did 30 minutes of a Cathe step workout before I did the MR workout. I'm very interested in the diet part and I'm working on that too (but I haven't read all of the material yet). There are 16 workouts altogether.