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You exercise too much

Pushing yourself is usually a good thing when it comes to physical activity. But your body needs rest, too, especially after an extra-hard workout. Signs that you are working out too hard can be mental and physical, and include fatigue, difficulty sleeping, decreased immunity, muscle soreness, and injury. To keep your workout fresh—and avoid overuse injuries—it's a good idea to vary your routine, and give yourself a day off now and then. "Sometimes, just sitting back and relaxing is better for your body than going to the gym for that hour," says Dr. Rogg.

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