“Squats work practically every single muscle in your body. Okay that’s an exaggeration, but it’s not far from the truth. If you’re looking to burn fat, you want to do exercises that trigger as much of your body as possible so it’s all getting worked and exercised. On the other side of the coin, if you’re looking to build muscle, your legs and back can put on the most muscle in the shortest amount of time.
If you are serious about getting in shape and losing weight, or if you’re a beanpole and looking to gain muscle, you absolutely need to include squats in your routine.” (http://nerdfitness.com/)