Exercise Video Demo: We've all seen those guys in the gym. They have massive biceps, a broad back, chisled chest, huge shoulders and then legs so tiny it makes them look as though they're about to tip over! Not only are powerful legs important for a well balanced and defined physique, but they're a calorie burning machine! The largest muscle group of the body are the leg muscles and there are almost countless ways to train them. This Leg Extension Exercise Video Demo shows you proper technique for anyone's level of fitness.
The Quads The Quadriceps Femoris literally means "4 headed muscle of the femur." It's main function is as the extensor muscle of the knee joint and it is also a flexor of the hip joint. An extensor muscle increase the angle of a body part and a flexor decreases the angle between two body parts. When doing a Leg Extension exercise you're straightening the knee thus creating a larger angle, and a squat would be an example of the quads working as a flexor muscle because it is shortening the angle at the hip.