I, personally, loved Hardcore Extreme and I am a "circuit type" of person. My favorite Hardcore workout is the High Step Challenge. Hardcore Extreme has one workout that mixes parts of High Step Challenge with aerobics and the other too are a mix of cardio from Kick max, Imax 3 and Low Max. I like the variety, although its a bit difficult to learn quickly since she spends no time moving from one clip to the next.