This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. “Right to the core,” “core values,” and “hardcore.” These little idioms highlight just how vital the concept of “core” is in our lives ...

STARTING A WORKOUT program for the first time can be equal parts excitement and confusion. The good news is it’s almost automatic that you’ll immediately begin to gain muscle as a beginner, no matter ...