How do I loose muscle without ending up with big muscle-less legs?

Hello, I am one of those scary cheetah 100 m-dash running girls who doesn't have big manly legs. I have been running for eight years and my legs haven't haunted me in my sleep once! : ) You can still participate in sports though if you are scare of building up too much muscle, and if you are required to lift some kind of weights at the gym, try using the same weight setting each time or just use a minimal weight setting. That way, the only thing you are doing is toning what you have and avoiding body builder legs.