D1 Training Preferred Sq. Footage: 2,000-10,000 s.f. 12-Month Anticipated Openings: ~50 Although D1 Training has only been expanding via franchisees for almost eight years, the athletic-training concept opened its 100th unit in January, with 100 more locations currently in development. All markets in the U.S., with the exception of Washington state and Hawaii, are being More