Your rear delts, or posterior deltoids, is the back part of your shoulder muscle. It originates on the spine of your shoulder blade and inserts on your humerus (upper arm bone). It aids your lats in extending your shoulder, and also externally rotates your shoulder, together with infraspinatus and teres minor of your rotator cuff.
In this article, you will learn about rear delt muscle anatomy, what some effective rear delt exercises are, and how you can combine them into a workout.
Rear Delt Muscle Anatomy
Your rear delts originate from the spine of your shoulder blade, partially covering your infraspinatus and teres minor, two muscles of your rotator cuff.
Your rear deltoid inserts on the outside of your upper arm, and it can thus both extend your shoulder (= bring your arm back, like in a row) and externally rotate it.
It is a synergist to your lats in shoulder extension, and a synergist to infraspinatus and teres minor in external shoulder rotation.
The upper parts of your rear delts also abducts your arm.
Rear Delt Exercises
In this section, we’ll take a look at three different rear delt exercises. If you train one or two of these exercises, that’s all you need for a good rear delt workout.
1. Barbell Row
First off, the barbell row. While the barbell row hardly isolates the work to your rear delts, it still trains them. Besides, different variations of rows are likely already (or at least should be) part of your training program for a well-developed back, as they do a great job at laying the foundation of your back musculature.
You can increase the work put on your rear delts by taking a wider grip on the bar, and rowing slightly higher on your chest. Note that it will require you to use a lighter weight than in standard rows.
2. Cable Rear Delt Row
A rope handle set high in a cable pulley works great for this exercise, but if you want to stick to free weights you can mimic the exercise by leaning forward and rowing in a similar motion with a barbell or a pair of dumbbells.
3. Reverse Dumbbell Fly
Go very light and focus on form in this exercise. If you’re swinging the weights up by using your hip, it means that you’ve taken work away from your rear delts.
- Reverse Machine Fly
- Reverse Cable Fly
Rear Delt Workout
So what does a good rear delt workout look like?
Well, first of all: depending on what exercises you already train for your back, you might already be training your rear delts well. Rowing and pulling exercises alone might not lead to optimal rear delt growth, but add in some reverse flyes and you’ve got them covered.
A specific rear deltoid workout could look something like this:
StrengthLog’s Rear Delt Workout
- Barbell Row: 3 sets x 8 reps
- Cable Rear Delt Row: 3 sets x 12 reps
- Reverse Dumbbell Fly: 3 sets x 15 reps
Together, these exercises will train your rear delts well, as well as provide training for other muscles in your upper back, such as your traps, rhomboids, and rotator cuffs. By combining different rep ranges (from low to high) it is also possible that you stimulate muscle growth via more mechanisms.
If you train these exercises with a good technique, and regularly try to increase the weight you are using while still maintaining good form, your rear delts are bound to grow bigger and stronger.
And that’s it! Hopefully, by now you have a good grasp of your rear delt muscle anatomy, what some effective rear delt exercises are, and how you can combine them into a rear delt workout.
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