What is a knee extension?

A knee extension is a resistance training exercise in which a load is placed on the shin and from a seated position, you contract your quadriceps muscles to extend the lower leg until the whole leg is sticking straight out. To perform a knee extension sit down in a machine or strap a weight to the ankle and sit down in a chair with your knee bent at approximately no degrees. Keep your spine and head in neutral alignment, contract your thigh muscle until your leg is completely straight, then slowly relax your thigh to bring your leg back to the original position.