Then, when it comes to sculpting those abs of your dreams, it’s not as simple as doing endless crunches. “Developing a six-pack requires more than just working the ‘pretty’ muscles that you can see,” Fitzgerald says. “The deeper, transverse core muscles must be strengthened first to create a strong, solid base—without that, only doing crunches can actually make your belly stick out more. Nobody wants that.”

Eat carbs. "There's this notion that carbs are bad and that you need crazy amounts of protein to be lean and fit," says Alcantara, who disagrees, and eats just as much carbs as protein, although the ideal ratio varies based on your goals. "Whatever you eat to get the results you want has to be sustainable, otherwise you're going to end up right back where you started with the same habits that got you there."

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