There are a lot of myths out there about fitness. Here's a list of some of the most common ones -- and the truths behind them.

1. You must exercise for 30 consecutive minutes to see results.

Three 10-minute sessions of exercise burn as many calories -- and provide nearly the same health benefits -- as one 30-minute session.

2. Lifting weights will turn you into a pro-wrestling contender.

Virtually all women (and most men) can’t develop huge muscles without spending hours a day in the gym lifting very heavy weights.

3. If you stop exercising, your muscles will turn to fat.

No -- they’ll just shrink. Fat and muscle are two different entities; you can’t turn one into the other.

4. By focusing on abdominal exercises, you can lose that beer gut.

You can’t selectively zap fat off a particular part of your body. To lose a beer gut, you need to lose weight and exercise (and probably cut down on the brewskis).

5. Exercising during pregnancy increases the risk of miscarriage or birth defects.

With a doctor’s approval, prenatal exercise is very healthy for you and your baby. In fact, studies show that labor and delivery are actually easier for women who exercise during pregnancy -- as is getting back to your pre-pregnancy weight.

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