Plank - 21 Day Challenge is a free Android app developed by FIT apps, designed to help both men and women strengthen and train their abs and core muscles. This app is perfect for those who want to work on their fitness at home. The main goal of the app is to help users burn belly fat, lose weight and achieve a flat stomach.

The app offers a 21-day plank challenge, which is considered the best exercise for the abdominal muscles. With this app, users can train their abs muscles and reduce weight in just 5 minutes per day. The app has a program designed for 21 days, making it easy for users to follow and achieve their fitness goals.

Plank - 21 Day Challenge offers a variety of workouts that can be done at home without any equipment. The app is suitable for those who want to work on their fitness and lose weight. With this app, users can improve their shape, train their body and arms, and make their stomach flat. Overall, Plank - 21 Day Challenge is an excellent app for those who want to work on their fitness at home and achieve their fitness goals in just 21 days.