1. Built-in health application: Open the "Health" application on iPhone, click "My Health" in the navigation bar below, enter the page, click the "Walking plus Running Distance" icon, enter the detailed setting interface, find the "Walking and Running Training" column in the setting page, and check the kilometer option to complete the setting.
2. Use the third-party fitness App: install the fitness App, find the setting entrance of "Walking Distance" on the homepage or personal information page, and select "km" on the setting page of "Walking Distance" to complete the setting.