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Circuit Trainer

A timer for circuit training with custom exercises

Privacy Friendly Circuit Trainer is an Android App that supports the user during his/her circuit training session. It provides a configurable set of timers for the exercises and the rest phases as well as multiple other features.

Workout Timer

After configuring the set of timers in the main menu you can start the workout routine by pressing the start button. The workout view has animations and sound output features which can be turned on and off inside the settings menu.

Motivation Alert

The app can show you motivation alerts to remind you of planned workout sessions. You can define the time of day and the notification texts inside the settings menu.

Block Periodization

When scheduling the timers you may also choose the block periodization feature. This feature allows you to configure longer, separate breaks in between the exercises. This way the workout can be split into multiple high intensity workout cycles.

Workout History

The app can collect statistics about your performed workout sessions. The collected data comprises of the time spend working out and the calories burnt while exercising. The accuracy of the calories calculation can be improved by configuring the necessary user data in the settings menu. The collection of this data can be deleted as well as turned on and off inside the settings menu.

Exercise Sets

The app allows you to create your own Exercise Sets for the circuit training. Therefore you can combine your own exercises to exercise sets. The image assigned to an exercise is displayed during the workout. In addition, the exercise sets can be repeated during a workout. For this you can set the number of rounds before starting the workout.

The app belongs to the Privacy Friendly Apps group developed by the research group SECUSO at the Karlsruhe Institute of Technology.


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

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  • Version 1.1 (2) suggested Added on 2019-10-01

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.

    Download APK 2.7 MiB PGP Signature | Build Log