If you want to become an athletic trainer, studying kinesiology would be the most direct and relevant path. Kinesiology is the study of human movement and exercise, which aligns well with the skills and knowledge needed to work as an athletic trainer. It covers topics like anatomy, physiology, biomechanics, and injury prevention and management, providing a solid foundation for understanding and treating athletic injuries. While medicine and physical medicine and rehabilitation (PM&R) are related fields, they focus more on medical diagnosis and treatment, which may not be as specialized for the role of an athletic trainer. Pursuing a degree in kinesiology will give you the expertise and qualifications necessary to work effectively with athletes and sports-related injuries.
I hope this helped!
~~~Harsha~~~