The purpose of this study was to investigate a potential mechanism for the clinically observed reduction in anterior hip pain by investigating the effect of posture on the movement patterns and the required moments during gait in healthy subjects. We hypothesized that walking in a swayback posture would require greater hip extension motion and greater hip flexor moments than walking in a natural posture. We also hypothesized that walking in a forward flexed posture with the hips and knees maintained in slight flexion, an exaggeration of the correction given to patients with anterior hip pain (Sahrmann, 2002), would reduce hip extension and reduce the moment requirements of the anterior hip muscles when compared to the natural posture. Modifications at one joint can have clinically important consequences at other joints (Zajac, 1993; Sueki et al., 2013), therefore, we also investigated changes in kinematics and kinetics at the knee and ankle