3. Snack well

Most people can eat small snacks right before and during exercise. The key is how you feel. Do what works best for you. Snacks eaten soon before exercise probably won't give you added energy if your workout lasts less than 60 minutes. But they may keep you from feeling hungry.

If your workout is longer than 60 minutes, it may help to have a carbohydrate-rich food or drink during the workout. Good snack choices include:

• An energy bar.
• A banana, an apple or other fresh fruit.
• Yogurt.
• A fruit smoothie.
• A whole-grain bagel or crackers.
• A low-fat granola bar.
• A peanut butter sandwich.
• Sports drink or diluted juice.

A healthy snack is especially important if you plan to work out many hours after a meal.