Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. 104 Anatomy & Physiology Essentials Lab Manual Muscle Group Activation Iliopsoas Quadriceps Hamstrings Anterior Leg Muscles Posterior Leg Muscles Pre-Swing Initial Swing Mid-Swing Terminal Swing Goodheart-Willcox Publisher B. What motion is occurring at each joint? Joint Motion Hip Knee Ankle Loading Response Mid-Stance Terminal Stance Pre-Swing Initial Swing Mid-Swing Terminal Swing Goodheart-Willcox Publisher