Windows only: Point free application BeatScanner at your music library to determine the beats per minute (BPM) of each track, then build playlists based on BPM for the perfect workout mix.
It's often said that the ideal BPM for workout music is somewhere between 120 and 140 BPM. That means if you wanted to use BeatScanner to help you build a killer workout playlist, you can let the app analyse your library, then set 130 BPM as your target and set the range to 10. With any luck, you'll be able to use this whittled down list to put together the perfect workout playlist. It's not the prettiest app you'll ever use, but it gets the job done.