Final answer:
The individual responsible for developing active movement exercises in the 1950s is not specifically named, but the development of rehabilitation exercises was influenced by various professionals in physical therapy and exercise science. Kenneth Cooper is notable for introducing aerobic exercise in the 1960s and founding the Cooper Institute, although his work is separate from the 1950s rehabilitation exercises.
Step-by-step explanation:
The individual credited with developing several active movement exercises in the 1950s for rehabilitation purposes is not explicitly named in common historical accounts.
Rehabilitation exercises for conditions such as orthopedic disabilities, spinal cord injuries, cerebral palsy, and polio were likely developed by a collaboration of healthcare professionals influenced by the burgeoning fields of physical therapy and exercise science at the time.
Meanwhile, Kenneth Cooper is known for introducing the concept of aerobic exercise in the 1960s, and later establishing the Cooper Institute in 1970, making significant contributions to preventive medicine and wellness through exercise. From the period post-World War II up to the modern day, professionals have continuously advanced knowledge around rehabilitative exercises for those with disabilities, inspired by societal optimism and social change movements.