The Japanese-born Okawa is President of Strong-S, Co. Ltd., the parent company of Sports and Field. The company is engaged in pro athlete management, licensing and strength and conditioning training. It is on the leading edge of sports training and management; instruction and outsourcing of sports training; business consulting in sport training; sports training institution management; cultivation of strength-conditioning coaches, personal trainers and fitness instructors; planning and management of events and seminars, and development and sales of fitness equipment. Okawa is known as an expert in sports training and has authority in movement physiology, fitness training, and strength and conditioning training for serious athletes. Among his clients are professional baseball players Hideo Nomo (Tampa Bay Devil Rays), Norihiro Nakamura (LA Dodgers), and many other professional athletes in Japan. For over 10 years Okawa also worked with Mark Asanovich, the former strength and conditioning coach for the Tampa Bay Buccaneers. Okawa also currently serves as the Head Strength & Conditioning Coach for the rugby team at Meiji University, a prestigious school with the record of 12 times of university championships.