Push-ups are one of the most simple, effective, and challenging exercises you can do. When done properly, they work your core, arm, and back muscles in a way that many other moves just don't. And let's be real, yeah, they're tough, but you can totally do a push-up. It's not like we're learning new dance choreography. We've done them since middle school PE!
To make the classic push-up a little more challenging and get more into the back and arm muscles (and work those obliques!) try this external rotation with a head-tapping "salute." This bodyweight exercise is going to rock your core, create strength, and give your back that definition you've been working toward.