Professional wrestling has followed the trajectory of Hollywood action stars, slimming down and balancing intense workouts with intelligent diets. That's not to say the iconic wrestlers built like pumped-up action stars of the '80s have turned into Fight Club-era Brad Pitts. Wrestlers, or Superstars, as they're called in WWE, are still big men. But on the whole they sport leaner muscle, are more agile than just about any athlete their size, and are healthier longer. Their secret? Smarter eating habits; CrossFit-style functional fitness; and the WWE Performance Center, the new training facility that treats them equally as entertainers and serious athletes. (Check out the video here for an exclusive behind-the-scenes look at the gym.) In light of this shift, we turned our attention to the fitness habits of the top Superstars to see just how they do it. With the help of a few nutritionists and trainers we looked closely at the habits of the WWE stars — and then ranked them according to their fitness prowess.