Working out your lower body is extremely important to your overall daily function. Proper leg workouts gives you stronger legs and also contributes to core strength and better stamina of the body. Legs are comprised of quadriceps i.e. front of thighs and hamstrings i.e. back of thighs. The leg muscle group is large so it can burn more calories. Leg exercises involving multiple joints like squats and lunges significantly enhance core stability.