Hi Traci!!
I was just sitting here wondering the same thing!! I've been doing Power Circut and Leaner Legs back to back, and I actually like it the way it is, but I read somewhere, that you shouldn't do it like that. I've decided to keep it as is, and when I come back to this rotation(in Nov), I am going to make it so they're not back to back and see if I notice a difference. I figure, if I'm not having a problem with it, I might as well keep it for the remainder of this rotation. Hope this helps!!