Are there any apps for an Iphone that says how many miles someone has walked?

Are there any apps for an Iphone that says how many miles someone has walked?

The health app that should already be on your phone does that

You did not tell us which iPhone or version iOS running on the phone.

If the bundled Health app does not do what you want, go to Apple's App store and search "pedometer". There are several apps from which to choose… Some you buy, some you don't (and have in-app advertising).

The Health app does that