This workout is the main reason I purchased the entire set since I don't love step cardio but I will do anything Cathe puts out & I knew I wanted this one plus the bonus abs & extended stretches. I am so happy I did-it does not dissappoint!!! Same as Cathe's other PHA's, alternating between lower & upper but this was seemed to have me more "breathy" - she does say it has more of a cardio effect than the others. There were not cardio bursts and the pace was not rushed, but the exercises were functional based & I was definitely winded. I absolutely loved all the new exercises/variations & the inclusion of the step & platform! Plus instead of repeating the exercises 3 times, you repeat them 2 times so it didn't feel too repetitive. Time flew by & I can't wait to do it again! The abs were really tough. I did the first stacking abs good but then with the obliques stacking & the plank stacking, let's just say the risers weren't being stacked quietly-it was rough, that will be one to work up to. But I totally loved the intense hard abs because it's a challenge & these moves make it such a new and refreshing way to attack the abs! I can't say enough awesome things about these two workouts-absolutely worth the money. Thank you Cathe for continuing to come up with fun new ways to torture us & yes, I felt it!!!