Core strength a beautiful thing—but not for aesthetic, Instagram-worthy reasons. It's about having the control and support to engage in…

Core strength a beautiful thing—but not for aesthetic, Instagram-worthy reasons. It's about having the control and support to engage in whatever you like to do (run along the local trail, play tennis, build furniture) without strain or injury. It’s not about what’s on the outside, padding and all; it’s about building strength on the inside, through the belly, side waist, glutes, and back. You're wary of adding a new routine to your packed schedule. Well, there's good news: