The document describes the muscle contractions and joint positions involved in 4 stages of lifting a box from the ground to chest level. Stage 1 involves standing with neutral joint positions. Stage 2 has shoulders flexed to 45 degrees, elbows flexed to 45 degrees, and hips flexed to 110-130 degrees. Stage 3 returns to full leg extension with elbows flexed to 90 degrees. Stage 4 has shoulders protracted and elevated and shoulders flexed to 90 degrees with elbows fully extended. Each stage lists the prime movers and synergists contracting concentrically and antagonists contracting eccentrically to achieve each joint position.