It’s free and allows you to track your workouts! There’s basically every exercise you can think of already in its system, and if they don’t have what you need, you can just custom make it! It’s also got diagrams/ instructions for most of the lifts, so if you don’t know how a machine works, or the mechanics of a specific lift, you can just look it up on the app! Incredibly helpful for staying with your fitness goals and seeing the progress you‘re making!