The shocking video raised one big question: Can you actually have a six-pack on your back?

The back consists of large, complex muscles that support your trunk and spine. There are many types of back muscles, and they are all essential, helping you walk, bend, twist, and hold your body ...

Ever spent months grinding away at crunches for abs that never seem to appear? Or done endless bicep curls without getting the toned arms you’re after? You might be focusing on all the wrong muscles.