Conveniently located in Mansfield, TX just off Broad Street, 1 mile east of TX 287, at 1836 Cannon Drive, Suite 600. Book a class today! At D1, we believe in training the entire body as a unit to produce optimal human performance. No gimmicks, no fads; we utilize trusted and proven training techniques used to build the world's best athletes and deliver them in age-appropriate programs led by our expert coaches. Nothing at D1 is random. Every workout, every day follows a strategic 8-week training cycle that is meticulously planned and backed by sports science.