The 'F' stands for 'functional', because the exercises in each class mimic everyday movements, like lifting, squatting, pushing, pulling, kicking, jumping, and so on. '45' refers to the time duration of each class. The workouts are designed to unify the muscle groups of the body and to make you look, move and perform better in all aspects of your life. The workouts are HIIT-style circuit training. Monday focuses on cardio, Tuesday on strength training, Wednesday cardio. You get the idea, until Saturday and Sunday, when the two workout styles are brought together to mix things up. No two workouts are the same. Team Training - Life Changing