When it comes to improving core stability, the plank has your back (and your front!). By working your transverse abdominis — the deep core muscles that wrap around your middle — as well as your back, shoulders and glutes (yes, you should activate your butt, too), you get a full body burn in one isometric movement. But the best thing about planks: You can continuously switch them up and make your muscles work even more. Check out these creative twists on a typical plank routine and you’ll see what we mean.
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."