I like Kathy Smith. I have 3 of hers. Beginners, Intermediate, and Advanced. So, depending on what you feel like 1 have a choice of 3. They are about 45 to 55 mins in length for the whole dvd, but you can stop early. The beginner holds the poses longer so it's more of a stretch than strength like the Advanced. I alternate Cathe with Kathy!!!!! Kathy Smith explains more about the inhale and exhale than Cathe does, incase it matters.