What is the breath practice of the Xiaomi Smart Band?

The Xiaomi Smart Band has a feature called Breathing. This feature will guide you through a series of deep breaths, aiming to promote relaxation and reduce stress.
For your reference, here's how the Breathing feature works:
1. Quickly ease your body and mind with a guided breathing exercise of 1–5 minutes' duration, following the breathing patterns shown on the display;
2. When you start a breathing session, the band displays a calming interface with an animation that guides you to inhale and exhale slowly;
3. The band provides haptic feedback, tapping the wrist to cue you when to inhale and exhale during the session;
4. The band also monitors your heart rate during the session to provide feedback on the effectiveness of the breathing exercises.