That is going to be an opinion based question. However, it best to look at what your intentions are as far what you would like to study. For example, is there a particular area or concentration within the field of exercise science. Exercise science is the umbrella term each school will cater to different areas of research within that university. So it best to go about finding your particular interest and then once you narrowed that down located schools with professors that conduct research in that area. For example, if you are particularly fond of biomechanics of spine you may want to head to Canada to University of Waterloo with Dr. McGill or if it motor behavior I would look into UNC or UF. ALWAYS visit the school and meet with the department and the professors you will work with directly. If you do not like your core professors in your department it is going to be a ROUGH time. Finally, the last bit of information I can give which is somewhat irrelevant to the question but I stand behind it is…”Best” is what you make of it. It does not have to be the number 1 ranked school in the country for you to thrive and be what you want to be. If you have any other questions or concerns feel free to contact me as I went through this entire lengthy process and learned the good and bad ways of going about it!
Fuel the Movement,