Are you put off by push-ups? Push-ups are a powerhouse exercise that enhance the entire body. In fact, in one swift movement, a single push-up can strengthen the major muscle groups located in the chest, back, core, glutes, shoulders and legs. And yet, many of us cringe at the thought of performing a push up. Not only can push-ups be challenging and intimidating, they can be dangerous to practice if you suffer from shoulder ailments or lower back pain.