TaeBo
Marisol,
I use TaeBo as my primary form of cardio because it has really improved my legs, rear and abs, so I enjoy having all the tapes (through #9). I used a heart rate monitor when I did each of the tapes - some are harder cardio-wise, others have more kicks or abs, etc. I pick a tape according to my mood and energy level, and don't like to repeat too often. My advice is if you do TaeBo only once in awhile, I'd say six are enough; if you're like me and do several a week, you might like the diversity of more choices!