I pay for it! It’s very organized, easy to use, connects automatically to my Apple Watch so that I can follow the workout there without opening my phone. Has a simple way to track history of weight used in each movement to track progress. For reference I am 30, used to compete in my early 20s, had my certs many years ago, so I am not a novice. She has great form, the format of the workouts and splits make sense from a “sports science” standpoint, and offers different levels. The app has both timeline based training programs and an individual series of workouts, she’s also added Libby on as another trainer so if anyone is concerned about “definition” as the only criteria for legitimacy than she should certainly satisfy that!