I don't know for sure, but my assumption was that it would be easier for beginners, since they are workouts geared for the workout newbie. I use my regular step for these workouts without any problems.
I think it may also be smaller because it is included with sales of the smaller step at places like Wal-Mart. I think Cathe said she made these specifically for The Step Company, and maybe they asked her to use it?
Melissa