Seven

Seven is designed for the busiest people on the planet. Based on the famous 7-minute workout, the app focuses on high-intensity circuits that require zero equipment and minimal time. It uses gamificationlike 'lives' and achievementsto keep you consistent. It is perfect for those who struggle to find time for the gym but want to maintain a baseline of fitness.

The interface is clean, simple, and incredibly effective for building a daily habit. If you can spare seven minutes, you have no excuse to skip your workout.