Born in Kudamatsu, Yamaguchi Prefecture, Koji Sakai earned his physical therapist license after graduating from the School of Physical Therapy at Chiba Medical and Welfare Professional Training College. He started his PT career by providing post-operative rehabilitation for orthopedic patients, and currently works in an outpatient setting providing physical therapy to a wide range of patients. Sakai also provides athletic training services to a high school basketball team in Chiba, focusing on players’ recovery and performance improvement.