Stand with feet shoulder width or narrower in trap bar, weight to each side. Squat down with feet flat, low back taut. Grasp handles to sides.
Lift bar by extending hips and knees to full extension. Pull shoulders back at top of lift if rounded. Return and repeat.
Target muscle is exercised isometrically . Throughout lift, keep hips low, shoulders high, arms and back straight.
Target (See Comments)