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What Type of Push-Ups Will Work My Rear Deltoids?
The rear delts are the smallest of the shoulder muscles, and usually the weakest.
Comprised of three separate sets of fibers, the deltoid muscles -- more commonly called the "delts" -- wrap around the contour of the shoulders. The largest of these is the anterior deltoid, which is the most visible on the shoulder and the muscle most people exercise the most -- too often to the exclusion of the other parts of the muscle. That's too bad because neglecting the middle and rear deltoids can not only cause you to have an unbalanced look, it can also result in serious shoulder problems.
Normal push-ups don't do much for the rear deltoids because the demands are mostly put on the front and middle delts. If you really want to work them, you might actually benefit more from doing the dumbbell rear lateral raise or lever seated reverse flies.
Alas, the options are quite limited for working those rear delts with pure body weight exercises. However, if you're taking a break from the gym or want to stick to a steady diet of body weight exercises, there is one push-up variation that will give them the tough love they deserve: the one-armed push-up.
About the Rear Delts
The rear delts are the smallest of the delt muscles and they're tucked away behind the shoulders. They cross the back of the shoulders and provide the opposing action to the anterior delts, allowing you to raise your arm backwards above your waist. ACE recommends targeting the rear delts at the beginning of your workout because it's usually the weakest of the shoulder muscles, then following up with the stronger front delt.
The American Council on Exercise recommends working the rear delts before the larger front delts.
Two-handed push-ups don't cut it for the rear delts, but switch to one-hand and their fibers will light up the EMG. At first, you may find it easier to do the push-up at an incline, using a bench or step.
Assume the push-up position with one hand placed on the floor or elevated surface. Your feet should be wider than a normal push-up, well past hip-width.
Holding your free hand close against your lower back, tense the muscles throughout your entire body.
Slowly bend your elbow to lower your body until your chest almost touches the floor. Extend the elbow to return to the starting position.
One-Armed Plyometric Push-Up with Medicine Ball
Now turbo-charge those one-handed push-ups with a medicine ball and your rear delts will definitely let you know they exist.
Kneel before a medicine ball, put one hand atop the ball and the other on the floor. The hands should be spaced at a slightly wider than the shoulders.
Position your upper body with one arm straight on the ground and your other arm bent with your hand on the ball. Straighten your body with your feet at shoulder width.
Bend your elbows to lower your body until you feel a stretch is your shoulders or chest and immediately thrust your body upward rapidly. Keep pushing down on the medicine ball, lifting your other hand off the floor as your body rises upward. Use the floor hand to catch yourself as you come back to the ground. Repeat.