The 2009 French Open is into it's second week, and while some players, like Venus Williams, saw quick exits in straight sets, Roger Federer had to come back from two down to overtake Tommy Haas in five sets. For those of us who weren't tearing it on the terre battue this weekend in Roland Garros, there are still some lessons that we can all use to keep fatigue at bay during any strenuous exercise, from tough three-setters to marathons.

Over at Tennis magazine they are following every move of the French Open, including the Nadal upset. But they also have some great advice for any athlete, tennis or otherwise, to survive against tough competition. Here are just a few of their tips to stave off exhaustion:

• Twitch Training – Muscle fibers come in two varieties, slow twitch and fast twitch. It's important to mix up both high intensity movements with extended, slower workouts to make sure the entire muscle is ready for whatever comes during competition.
• Clear Thinking – Exertion is not just in your muscles; it's also in your head. Before big matches make sure you feel alert and calm. If you're already mentally weary, try taking a short nap, have a cup of tea or take some deep breaths so you can focus.
• Sip Cold Water – Drinking cold water a half-hour before exercise reduces physiological strain. So have a few glasses before you hit the court or the field, and then make sure to keep swallowing chilled water throughout the workout.