Jaywalk

With this great app I found, you can get rewarded for your walking activities and spend or redeem them at any participating merchant in your neighborhood. The reward system works simply by walking around, share content and interact with other users in your local area.

They will convert your activity data from the health app. And it is done effectively through Jaywalk's tracking of your location and walking data by connecting with the Apple HealthKit APIs. The Jaycoin received can be redeemed at any merchant’s that is participating in the program.

Overall,

Jaywalk's mission is two-fold: Motivate people to be more active, while increasing foot traffic for local businesses. Your local businesses need you and want to support your health! Get active and support your community at the same timesource

I hope you also try this out too. But note that GPS usage can drain your battery too quickly but who doesn't want free money anyway?