No matter how much I workout my legs, my leg muscles just won't get bigger. My upper body is pretty good sized, but I have toothpick legs. I do squats with the heaviest weight on a barbell that I can lift up over my head and rest on my shoulders. But no matter how much weight I use, and how much I workout squatting, it just doesn't do anything. Why won't my leg muscles grow? What am I doing wrong? And does anyone know of a workout program that will make my leg muscles grow? Thanks in advance.