Front Squats places more emphasis on the quadriceps as compared to back squats.
Preparation
Grasp barbell from rack or clean barbell from floor with overhand open grip, slightly wider than shoulder width. Position chest high with back arched. Place bar in front of neck or upper chest with elbows placed forward as high as possible. With wide stance, position toes outward.
Execution
Descend until knees and hips are fully bent or until thighs are just past parallel to floor. Knees travel in direction of toes. Extend knees and hips until legs are straight. Return and repeat.