Import previous workouts
If you have used another logging system before, it is beneficial (but not necessary) to enter your previous sessions into Calistree.
By doing that, the app will be able to use your previous sessions to calculate more accurately your experience level. It will also automatically calculate your mastery and Personal records for all logged exercises.
Entering previous sessions has to be done manually. Start an "Empty workout session", add the exercises, sets and reps, and Finish the session. Then open it and click on the three dots in the top-right corner and click "Edit". Then adjust the date and the workout duration and save the changes. If your other workouts are similar, you can simply click on "Start Session" from there to log another workout session with the same structure.