_With all the conflicting research and pseudo-scientific claims about fitness and training techniques revealed each day, only one thing's for sure: There's more than one way to carve an ab. And as long as we all have a body to experiment on—our own—everyone's a potential expert with a strong take on what to eat, what to do, how to stay motivated and what makes results last. The figures on this list have different credentials, experience, motivation, and goals for making the world stronger, healthier, and sexier. And they all think they've got the answer. There's plenty to argue about.

Third infant cronobacter_A third infant in the United States has tested positive for the infection that led to the death of one infant, sickened another and spurred a probe of baby formula, including Enfamil by Mead Johnson Nutrition Co.