Located near Central West End in St. Louis, 121 Fitness is a private gym and personal training program founded by Pat Mahoney. Olympic Weightlifting, Crossfit, and Strongman along with personal health are combine to create the core of the personal training program, DEFINE U. With over 20 years in the industry and over 10,000 trainees developed into professional athletes, 121 continuously works to redefine and reinvent fitness to create the best personalized experience for each individual.