The HardCore Series - pure and simple.
I have been using the HC series only for about 11 weeks now, and my legs are finally getting some tone and definition.
I just only added GS: Legs to the rotation this month, so it has nothing to do with a purely leg workout. The first 8 weeks of the rotation it was only MM, IM#3, LM, HSC, SM, CM and KM. I gotta believe it is the plyos and squats, mostly all without weights that has helped me turn the corner.
Tammy