How to use Apple mobile phone for healthy breathing?

1. First, turn on the iPhone, open the "Health" application, and follow the steps on the screen.

2. Secondly, if you don't see the setting prompt, click the Browse tab, click Breathe, click Blood Oxygen, and click Enable.

3. Finally, after the iPhone is set up, open the settings of AppleWatch, click Blood Oxygen, open "Blood Oxygen Measurement", and click the "Blood Oxygen" application on the home screen to start using healthy breathing.