This book sheds new light on the effects of aging and movement disorders on movement control during walking and postural tasks. Understanding these dynamics is more important than ever as we face a future where the number of older adults is projected to double by 2050. The severity of this framework is exacerbated when aging is accompanied by movement disorders such as Parkinson's disease, Chorea, Multiple Sclerosis, Dystonia, and Huntington's disease. The book explores how complex interactions between musculoskeletal and neural systems are required for efficient execution of daily activities like walking and maintaining posture.