It's the videos themselves. I don't really find the pacing enjoyable nor the format.
It's set up into 4 dvds: a beginner instructional one, which you have to do to try the other dvds, but is bloody boring. They could have found a way to teach the steps without it being 'these are the steps'. If I'm going to try to work out for an hour, I don't want to spend 4 days not working out so I can learn the steps enough to do the other dvds. 2 of the dvds are workouts. One's a 40 minute one and one's a set of 20 minute ones. They're okay, but I find I can't get over the cheese factor of the instructors, and if you don't do the instructional video, you can't follow along. The last dvd is just songs that you pick to work out to.
This is the one I have.http://www.amazon.ca/Zumba-Fitness-Exhil...d=1O9HELZRDTAJ6
I use the arm weights for my 30 day shred now.