Nike Mexico is offering runners a sweet reward in exchange for their exercise -- and we're not talking healthy lungs. "Subasta de Kilometros" turns distances into currency. Users can download the Nike Running+ app or one of Nike+'s products, which track running data. Then, the Facebook app allows them to bid on a certain item, using the distance they've covered in the last seven days. The bidder with the most money wins the product, which is usually Nike apparel or equipment.