whether you want to strengthen your arms and build definition in your upper body and back,then drop and give me 20. Yep, I'm talking push-ups. Because this simple exercise is also one of the most effective. Changing up the kind of push-up you do will target different areas of your arms and back. Learn which variation works which fraction of your body, or then just pick your push-up. - Additional reporting by Macy Williams
Source: popsugar.com