When it comes to effective, efficient, calorie-torching, heart-pumping workouts, CrossFit tops our list for surefire paths to fitness prowess. And we're not complaining about all the eye candy of chiseled abs we see at the gym, either. But a high-intensity gym regimen is only part of the equation when it comes to healthy, sustained weight loss and sculpting lean, toned muscle."Given the intensity of CrossFit workouts, an essential component of a good...