“Auxiliary exercises are not just for show—they’re for building the strength you can’t see.”—Louie Simmons The SFL StrongFirst Barbell Instructor Certification is a rigorous test of strength, technique, and resilience, demanding mastery of fundamental barbell lifts: the back squat, bench press, military press, and deadlift. To earn the SFL Certification, candidates must demonstrate impeccable form under heavy loads while meeting strict performance standards.