Run-to-Earn (r2e.finance) is a lifestyle app combining Social-Fi and Game-Fi elements. Users earn Run2E tokens by walking, jogging, or running outdoors using NFT Sneakers. These tokens can be used to upgrade and purchase new sneakers within the app. The project aims to build a large running community, promote physical health, and reward runners through tokens and tournaments. It's similar to other 'to-earn' projects like Ride2Earn, where users earn tokens for cycling, and Label2Earn, which rewards drawing.