The “F” stands for functional Training. The “45” the total time of all of our classes - 45 minutes. THE SIMPLE CONCEPT Our studios all over the world offer a 45 minute High-Intensity, Circuit Training workout class for our studio members. We have developed 36 different 45 minute workouts, with more currently in development. Our studios offer the same class at different times throughout the day. Every day throughout the week offers a different 45 minute workout. The workouts are created by the F45 Athletics and Peak Performance Department from a database of over 4,000 different exercises, so our members never get the same workout twice.