"30 days challenge" offers you many sports challenges to realize in 30 days: - Squat - Crunch - Plank - Push-up - And many stretching exercise More than 20 challenges are available. You can choose your favorite exercises and redo them as much as you want. You can also create your own challenges according to your desires! 30 days challenge is the perfect tool to motivate you and train yourself easily! The application is available in French, English and Japanese.