This paper presents a hierarchical control pipeline utilizing the whole-body musculoskeletal system to enhance quantitative understanding of human static balance and falls. We elucidated the spatiotemporal dynamics of balance during stable posture, elucidated the impact of muscle damage on balance behavior, and generated fall contact patterns consistent with clinical data. Furthermore, we demonstrated that a simulated hip-worn exoskeleton assistive device was effective in improving balance and reducing muscle activity during disturbances. This provides insight into the dynamics of human balance at the muscle level, which is difficult to obtain experimentally, and may contribute to the development of targeted interventions for people with balance disorders and the advancement of humanoid robotic systems.