Your core is an integral part of daily functions and your athletic performance—it’s used every time you sneeze, cough, have a bowel movement, pick things up, or do something more obvious… like sprint.

Why? Because your abs, obliques, and lower back muscles, along with your glutes, are meant to function as a unit, says Men's Health fitness director Ebenezer Samuel, C.S.C.S . And whenever possible, ...

When I first started running, I thought a solid core workout looked like blasting through some crunches and sit-ups and then checking for any signs of visible ab definition. It turns out I had core ...