“New year, new me.” Or so the saying goes. Whether breaking old habits in dating or prioritizing health goals, it is a great time of year to set up new routines to achieve the results you want to see.

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 ...