Let me start off by saying that I own several workout dvd's, including Jillian's 30 day shred, yoga meltdown, and biggest loser last chance workout (among others). I love to have a variety so I never get bored, so I recently picked up Bob Harpers "Yoga for the warrior".I LOVE IT- It is more challenging than the traditional yoga videos and I really like his training style! That particular dvd has a 60 min yoga workout and also a 10 min ab workout that's pretty exhausting... So the other day I decided to buy his "cardio conditioning" dvd. WOW I hadn't realized that my lower back was so weak, because today I am definitely feeling sore! It includes a 60 min workout and a shorter version that focuses on balance. Anyway, I recommend the two I've tried so far, to anyone who wants to try something a little more difficult and has graduated from the 30 day shred.