Alberto Contador, the winner of last year's Tour day Frantz, has thin legs.
It's an American obsession with large things that assumes that larger always means more powerful.
I have huge legs and I'm weak as a baby kitten with the sniffles.
Embrace your genetic strengths and get on with it. If you're genetically skinny, you're going to spend a lot of time and effort on very little benefit. As my dad used to say, "you can't make chicken salad out of chicken *****".
Az