When you're tired, the last thing you may want to do is exercise. But doing just that is really what you need. Here's why:

1. Exercise will pump oxygen into your blood and brain. Your circulatory system and organs will benefit.

2. Exercise can help keep adrenal hormones in balance. You`ll be able to deal with stress more easily if those hormones are not swinging wildly.

3. Exercise can help normalize blood sugar so your body has a steady supply of energy from which to draw. Fatigue and listlessness can result from drops in blood sugar.

4. Exercise can help emotional stress. A workout provides a healthy outlet for venting frustrations, and as your physical condition improves, self-confidence for a job well done should follow.

5. Exercise releases the body's natural painkillers. The chemicals, called endorphins, can create feelings of well-being and happiness, a big perk for a fatigued mind.