I was pleasantly surprised with this workout! I was skeptical as to how effective a 3-minute aerobic, 2-minute weights, and 1-minute core workout would be... but it was great! I was sweating, my heart-rate was escalating, and by the end, I felt energized and strong! The instructor is delightful (very encouraging and fun), and the mood and music are upbeat. There are even tips that scroll at the bottom of the screen to help make it the most effective (breathing, positioning techniques, etc.) After the workout, one of the women demonstrates other useful relaxation and massage techniques. I am very happy with this purchase, and will use this circuit often as part of my workout regime!