CTRLFIT is a free advanced workout log available on Android devices. This app allows you to plan workouts of any level of difficulty by creating programs and tracking your progress. You can write down your own workout program or choose from the selection of built-in programs. The app offers a variety of free features, such as detailed set planning, recording of workout results, and a base of 500+ exercises with videos and descriptions. It also supports supersets of any difficulty and a workout player that allows you to follow the pre-set exercise sequence.

The app also has additional modules that can be purchased to provide more feedback and simplify data entry. The modules include body parameter measurement, a body fat percentage calculator, a workout timer, tools for quick exercise set creation, and tools for easy workout difficulty modification. Purchasing these modules supports the team creating this app and helps with upgrades.

In summary, CTRLFIT is an excellent workout log that offers a range of free features and additional modules for purchase. It's a must-have for anyone looking to track their progress and achieve their fitness goals.