1. On the watch's home screen, slide down from the top to open the control center.
2. Click the "Fitness" icon, and it will be displayed as a little runner icon.
3. In the fitness interface, slide up or down to find the "Outdoor Stairs Climbing" option.
4, click on the "outdoor stairs" option, enter the stair climbing mode.
5. In stair climbing mode, you can start recording stair climbing activities. The watch will automatically track the number of stairs climbed and the height of the climbing floor.