Det visar att man lever, kära du. :3
But really, workouts should be felt. The one feeling that's better than working out, is the feeling of having worked out. Relax with a good book, while your roommates nephew sits by your computer playing BF3-alpha, for instance. (He's legally named Yoda, fyi. And reaaally cute. But only 14. But looking isn't illegal, is it? )