Barbell squat

Rest a barbell on the upper portion of your back, not your neck. Firmly grip the bar with your hands almost twice your shoulder width apart. Position your feet about shoulder width apart and your toes should be pointing just a little outward with your knees in the same direction. Keep your back as straight as possible and your chin up, bend your knees and slowly lower your hips straight down until your thighs are parallel to the floor. Once you reach the bottom position, press the weight up back to the starting position. Don't lean over or curve your back forward! You can use a belt to help reduce the chance of lower back injury. You can put your heels on a 1 inch block to further work the quads. You can also use a wider stance to work the inner quads even more.