Reduce Muscle Bulk How Can I Reduce Muscle Mass?

How can i reduce muscle mass? - reduce muscle bulk

I am a little girl, but I have more muscle mass than most (think Turner's) body. I work out 3-5 times per week to keep fit, but I want my slim arms and legs simultaneously. I do not know how, because I'm working on, and seems to get to the muscle. I do not know strengh training in their legs and run only the elliptical.