IF you are headed out for a walk or jog, consider adding an app for your trip. Several smartphone apps can add a helpful boost of motivation, or just some fun information, to a workout or leisurely walk.

Music can be a great help to runners, but sometimes putting together a playlist can be a chore. So leave the song selection up to RockMyRun. This free iOS and Android app streams music while you run, serving mixes of tracks from its archive, with a fun twist: You can choose how many beats per minute the music should have, and the app will match the songs to the pace. If you are out for a fast run, you may choose a speedy setting of 150 to 160 beats per minute. For a slower jog, try 120 beats per minute, and so on.

You can also choose the music genre, mix the lengths of songs, decide whether explicit lyrics are allowed, and even search for a particular track or artist you like.

The app then selects the mix, which can last up to two hours. You can skip a song you don’t like, but that requires fishing out the phone to tap the screen.