I was leaving my Zumba class with achy knees because the tread of my regular athletic shoes wouldn't allow me to turn or slide as easily as I needed to on the concrete floor.  So, I ordered these little guys (and they are small, so order at least one size up!) and I've had no aches or pains since.  The shoe bends completely in the middle because of the split sole, which gives me flexibility and adds a little bounce to my step, I think.  If you're looking for a shoe for a dance fitness class like Zumba, this one is a great choice!