and hip, move hip backward and knees forward until thighs are parallel to floor. Viewed from the side the arms now remain about perpendicular to floor Keep back straight. Return, keep knees slightly flexed. Repeat.
and hip, move hip backward down and knees forward until barbell reaches lower knees. Keep back straight and look ahead. Return by extending knees and hips. At top of motion flex shoulders and upper back. Repeat.