In a big year for parasports in Tokyo, we follow 3 technicians whose expertise aids the performance of competitors from around the world. Wheelchair engineer Ozawa Toru calibrates his devices to match athletes' requirements to the nearest gram and millimeter. MIT alumnus Endo Ken creates prosthetic blades both to suit the needs of top competitors and ease hurdles to access for parasports beginners. And Hamada Atsushi pioneers novel blade designs to maximize the performance of para-athletes.