Forget running -- try sex instead

Show me someone who likes gym exercise and I'll show you someone who's either a liar or a masochist (or both).

There's only one place people REALLY like to grunt, groan, moan and sweat, and that's in the bedroom -- and new research shows why sex is just about the only form of "exercise" that gets my full endorsement: It works!

In fact, you can burn almost as many calories hitting the mattress as you would hitting the pavement or treadmill.

For men, sex burns 4.2 calories per minute. And for women, a good bedroom romp will burn off 3.1 calories per minute, according to the new study. That's more than a walk... but not quite as much as a run.

And while walking and running only work out the legs -- and come with a risk of knee and ankle damage -- sex will get your whole body moving and grooving at once.

And if you do it right, there's no risk of injury.

The downside? If you want to burn more calories, you need your sex sessions to last longer than a commercial break.

Most people manage to do that easily, with the study showing that the average session lasts 24 minutes -- long enough for men to burn off 104 calories and women to burn off 69 calories.

But 24 minutes is what I'd call "a good start." If you REALLY want good sex and good exercise at the same time -- and if you really want to please both your partner and yourself -- make it last a whole lot longer than 24 minutes.

It's worth the extra effort -- because along with moving your muscles and burning calories, sex can help prevent heart problems, and even help you recover if you already have them.

If that's not enough, sex also unleashes a wave of feel-good endorphins, which can help lift your mood, ease stress, fight pain, boost your immune system and prevent disease.

Of course, there's only so much sex you can have in a day (but feel free to test your limit), and that means you also have to pick some other ways to stay active.

But you still don't need to waste time and money -- or risk injury -- in a gym.

Keep reading!