My fiance wanted to do that same thing. She was a dancer and had the same type of legs. I tweaked her diet. Then I started her with some pylometrics, circuit training, and boxing. It has worked great...
We just switched it up again and are now trying strength, power, endurance routines (ex. of set 1: squats, jump squat, 3 min run, 1 min rest)
Completely shocking her enegry systems..
Wish I could tell you exactly why this has worked, but iv'e only tried it with her so far.
plz post what you end up trying