Yes, it is an interval workout. Otherwise, Cathe wouldn't have come up with a blast only premix like in Imax 2 and 3. Since Low Max is low impact, you do have to work harder to get your heartrate up. That's why Cathe uses an 8-in. step. It is not in the same league as the Imaxes, but it's still a great workout. The blast premix alone is a great way to work your legs without weight.
Pinky