There’s no shortage of glute-boosting training sessions online – but most overlook the smaller accessory moves that build real strength and balance. One of the most underrated? The clamshell exercise.

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 ...