We already know that cranking tunes during your workout can boost endurance by up to 15 percent. But now there’s another bonus to an iPod-enhanced sweat session: a better mood during your gym time.

In the digital iTunes era, most of us are familiar with making playlists even if only to separate one person’s downloads from another’s.  But how many of us have separate playlists for waking up in the morning, driving to work, getting revved for a public speech, or winding down at night?  That’s something we should [...]