TeenDS: Exercise & Physical Fitness Support Group
A community to discuss ways to get fit and healthy, share exercise routines, and talk about building muscle and physical endurance. You have questions and you are not alone in asking them. Talk to many others and get answers and support to meet your fitness goals.
In terms of losing muscle all I can think of is the saying "if you don't use it you lose it". You may just have to embrace your muscular legs if it is ingrained into your genetics.
All in all you could try some circuit training focusing more on the upper body. That could aid in fat loss as well as avoid working your legs as much.