Some days you really, really, REALLY don't feel like working out, but dealing with the guilty feeling of skipping your workout isn't fun either. Here's a compromise: Tell yourself you just have to do five minutes. That's it. If you still feel bad or tired or miserable after five minutes, you can quit and go home, but give it your all for those five minutes. Once you get going, you'll want to do more, and it won't be quite as bad as you thought.