“If you want to build bigger, stronger and well balanced legs, then you need to build your quadriceps.
Learn the basic anatomy of your quadriceps (or quads), and how they work, as well as some of the best exercises for targeting muscle development, including how-to properly do squats, alternating lunges, leg extensions, hack squats and the leg press.”http://www.amazedfitness.com/workout-tips/build-bigger-legs-how-to-target-the-quads-workout-tips/