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 ...

You're not alone if you wince when you think about doing a plank, sit-up, or crunch. I feel exactly the same way. Whether it's the burning in my abs or the requirement to be at one with my yoga mat, I ...