A tie between Power Max and Step Works. I also absolutely love the step sections of Body Max and CTX, but I thought I would just focus on pure step tapes. Step Works has 40 minutes of cardio, and Power Max has 45. Power Max has an awesome pendulum move and great music like "Wild Thing" and "Push It." Step Works has mainly instrumental music but Cathe seems super energetic in this one and her enthusiasm is contagious. Plus I love the third section of this one so I end on a 'high' note. Have fun and remember, if it's a Cathe step tape you're buying, you can't go wrong!