"Muscle Tracker" is a system designed for conducting sessions in which the data recorded using Callibri devices are transferred to a mobile application. In the application it is possible to save and view the results of sessions, filter them by date. The mobile application is part of the "Muscle Tracker" system. Detailed information about the system can be found on the official website of the manufacturer. In order to conduct sessions in the application, it is necessary to register a user account and purchase Callibri devices.