When I'm filled with anxiety, panic, or worry, exercise usually helps. It allows me to clear my head, focus inward, and collect a fresh perspective. There's nothing groundbreaking about my strategy. It helps loads of people who find themselves in all sorts of stressful scenarios.

Health experts have long recommended 30 minutes of moderate daily exercise to relieve stress. Researchers at the University of Missouri-Columbia agree. But they've got an even better recommendation. They say studies show high-intensity workouts pack a much bigger punch against stress than any other form of exercise. Why? There are several theories. We know intense aerobic exercise strengthens the heart and lungs, and these two vital organs bear the brunt of the body's stress response. So the more we exercise, the better these organs respond to negative emotion. Another possibility: Vigorous workouts require major concentration and limit the ability to obsess about weighty matters. It could also be that this type of exercise increases the release of endorphins, our feel-good hormones. The harder we work, the better we feel.

I guess it doesn't really matter why strenuous activity does the trick. It just does. And that's reason enough for me to keep at it.