Adidas has teamed up with Spotify to create the first running app that matches a runner's speed. The new Adidas Go uses the smartphone's accelerometer to monitor the user's stride and then automatically plays tracks with matching beats per minute from Spotify's music library. The app also allows runners to effortlessly explore new music and expand their running soundtrack, as it intuitively streams Spotify tracks that match the runner's interests based on their preferred playlists, artists and genres. At the end of the workout, users can add these songs to their collection. Adidas Go is available for iOS only via the Apple App Store, with support for devices from iPhone 4S or later models.