Begin by positioning a barbell at or just below shoulder level in the squat rack. Place yourself underneath the barbell. Make sure the bar is across your upper traps and not on your neck. Feet should be just wider than shoulder-width with your feet slightly turned out. Grip the bar with your hands comfortably wider than shoulder width. Brace your core and keep your chest up. Bending at the knees, drive your hips back and down as if you are going to sit on a chair. Lower slowly with control until your thighs are parallel to the floor or deeper depending on your range, making sure your knees are pointing in the same direction as your feet and that your lower back doesn't collapse. Inhaling throughout this lowering phase. Pause at the bottom, then push through your feet to extend your legs and drive your hips forward to return to the start position, exhaling as you do so.