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 ...

After surviving the first training session with Chris Heria, I decided to come back for Part 2—but this time, the challenge was even more intense! From advanced calisthenics, brutal endurance drills, ...