Remember in Sex and the City, when Carrie said to herself about Big's new wife Natasha, "I will never be the woman with the perfect hair, who can wear white and not spill on it." Welp, Carrie. We feel you. Because when it comes to Jennifer Aniston, we will never be the woman with her chiseled abs. I mean really, what is going on in there?! The woman looks better at 41 than most of our twenty something friends and coworkers.

Aniston showed off "the girls" (we're talking about her abs, but the other girls don't look so bad either!) for her latest Smart Water ad. "Working out feels great...afterwards," the ad's copy reads. "That's why I drink Smart. It's hydration I can feel. (And it's one part of my routine I never sweat.)" If we drink Smart Water, will this automatically happen to us? Survey says it takes a little more than that, with Aniston as proof.

We can't be too hard on ourselves however, celebrities have countless hours to work out, with the top trainers in the world whipping them into shape. If you want to get your own toned tummy — factor some of these tidbits of exercise knowledge into your daily routine.

Lift weights. University of Pennsylvania researchers tracked 164 women and found that those who lifted weights for an hour twice a week lost 15 percent more abdominal fat than those who didn't. They also cut their total body fat by almost four percent.

Cut back on sodium. The more sodium in your diet, the more bloating that will occur. No one wants that.

Sleep! You hear it time and time again, but it's true. Research shows the more tired you are, the more likely you are to shove sugar in your mouth to keep yourself awake or go on an emotional-eating binge. Aim for at least seven hours a night.

See what tricks your other favorite celebs are using to stay in shape this summer.

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