According to SuperSkinnyMe.com, muscular thighs can be slimmed down by performing cardiovascular exercises, endurance running, resistance training and by avoiding squats and similar exercises. Exercises such as squats, leg curls and calf raises do not make thighs slimmer, but rather enlarge muscle fibers.
SuperSkinnyMe.com explains that to achieve slim thighs, a person needs to burn fat without increasing muscle mass in the area. This can be done by performing long-duration cardio exercises like endurance running. Once the fat decreases, resistance training can be performed to enhance the definition of the thigh muscles. It is recommended to complete more repetitions with light weights so the muscles are strong and defined but not too large.