Learning how to do back flys with dumbbells is a fundamental step for anyone looking to build a stronger, more balanced upper body. This exercise, also known as the rear delt fly, specifically targets the rear deltoids and upper back, crucial for posture and balancing shoulder development. It’s a simple yet highly effective movement that can correct rounded shoulders and improve your overall physique.
This guide will walk you through everything you need to know. We’ll cover the proper form, common mistakes, and how to integrate this exercise into your routine for the best results.
How To Do Back Flys With Dumbbells
Performing the dumbbell back fly with correct technique is essential to work the intended muscles and avoid injury. The focus should always be on control and the mind-muscle connection, not on lifting heavy weight. Here is the step-by-step process.
Step-By-Step Instructions For Proper Form
Follow these steps carefully to master the movement pattern.
- Select two light to moderate dumbbells. It’s better to start too light than too heavy.
- Stand with your feet shoulder-width apart, holding a dumbbell in each hand.
- Hinge forward at your hips until your torso is nearly parallel to the floor. Keep your back straight, not rounded.
- Let the dumbbells hang directly below your shoulders with your palms facing each other. Your arms should have a slight bend in the elbows and maintain this angle throughout the movement.
- Take a breath in, and as you exhale, squeeze your shoulder blades together and lift the dumbbells out to your sides. Lead with your elbows, not your hands.
- Continue lifting until your arms are roughly in line with your torso. Do not swing the weights upward.
- At the top of the movement, pause for a second and focus on squeezing your rear shoulder muscles.
- Slowly lower the dumbbells back to the starting position with control, inhaling as you go.
Common Form Mistakes To Avoid
Even experienced lifters can fall into these traps. Be mindful of these errors.
- Using Too Much Weight: This is the most common error. It leads to swinging, using momentum, and recruiting the wrong muscles like your traps and lower back.
- Rounding The Back: Keep a neutral spine. A rounded back places unnecessary stress on your lumbar spine.
- Straightening The Arms: Locking out your elbows turns the exercise into a less effective movement and can strain your joints. Maintain that soft elbow bend.
- Shrugging The Shoulders: Avoid pulling your shoulders up toward your ears. Keep them down and back to isolate the rear delts.
- Lifting Too High: Going past parallel with your torso can shift the work to the upper traps and rhomboids, reducing focus on the rear delts.
Muscles Worked By The Dumbbell Back Fly
While the rear deltoid is the primary mover, several other muscles contribute to the movement.
- Rear Deltoids: The main target. These muscles are responsible for horizontally abducting the arm (pulling it out to the side).
- Rhomboids: Located between your shoulder blades, these muscles retract the scapulae (pull your shoulder blades together).
- Middle and Lower Trapezius: These sections of your traps assist in scapular retraction and depression, supporting good posture.
- Teres Minor and Infraspinatus: These are two of the four rotator cuff muscles that stabilize the shoulder joint during the movement.
Variations Of The Dumbbell Back Fly
Once you’ve mastered the standard bent-over version, you can try these variations to challenge your muscles in new ways or accommodate different equipment.
Seated Bent-Over Dumbbell Fly
This variation eliminates any potential leg drive or body english, forcing strict form.
Sit on the edge of a flat bench with your feet planted firmly. Lean forward, resting your chest on your thighs. Perform the fly movement from this position, keeping your torso braced against your legs.
Incline Bench Dumbbell Rear Delt Fly
Using an incline bench set to a 30-45 degree angle provides excellent support for your chest and lower back.
Lie face down on the bench with a dumbbell in each hand, letting them hang straight down. Perform the flying motion, focusing on the squeeze at the top. This is a great option if you find it difficult to maintain a stable bent-over position.
Standing Cable Rear Delt Fly
Cables provide constant tension throughout the entire range of motion, which can enhance muscle activation.
Set two cable pulleys to about chest height. Stand in the center, grabbing a handle in each hand. Step forward slightly, hinge at the hips, and perform the fly movement, crossing the cables in front of you at the end of the motion for an extra contraction.
Programming And Integration Into Your Workout
To get the most from back flys, you need to program them correctly within your weekly training split.
Recommended Sets, Reps, And Frequency
Because the rear delts are smaller muscles that respond well to higher volume, use these guidelines.
- For Muscle Growth (Hypertrophy): 3-4 sets of 10-15 reps. Use a weight that challenges you in this rep range while maintaining perfect form.
- For Muscular Endurance: 2-3 sets of 15-20+ reps with lighter weights.
- Frequency: Train your rear delts 2-3 times per week. They recover relatively quickly, so you can include them on both shoulder and back days.
Where To Place Back Flys In Your Routine
Exercise order matters. Since the rear delts are smaller stabilizer muscles, it’s generally best to prioritize larger compound movements first.
On a shoulder day, perform overhead presses and upright rows before your rear delt flys. On a back day, complete your rows and pull-ups first. This ensures you are not pre-fatiguing muscles needed for the bigger lifts.
Sample Shoulder And Back Workouts
Sample Shoulder Day
- Overhead Barbell Press: 4 sets of 6-8 reps
- Dumbbell Lateral Raises: 3 sets of 10-12 reps
- How To Do Back Flys With Dumbbells: 3 sets of 12-15 reps
- Face Pulls: 3 sets of 15-20 reps
Sample Back Day (With Rear Delt Focus)
- Pull-Ups: 4 sets to failure
- Bent-Over Barbell Rows: 4 sets of 8-10 reps
- Seated Cable Rows: 3 sets of 10-12 reps
- Incline Bench Dumbbell Rear Delt Fly: 3 sets of 12-15 reps
Benefits Of Incorporating Back Flys
Adding this exercise to your regimen offers several key advantages beyond just building muscle.
Improved Posture And Shoulder Health
Modern life often leads to overdeveloped chest and front delts from pushing movements and desk work. Strengthening the rear delts and upper back pulls the shoulders back, counteracting that forward slump. This reduces strain on the neck and upper back, alleviating pain.
Enhanced Shoulder Aesthetics And Balance
Well-developed rear delts give your shoulders a full, rounded, and 3D look from all angles. It completes the appearance of the shoulder capsule, preventing the “flat shoulder” look that comes from only training the front and side delts.
Increased Performance In Compound Lifts
Strong rear delts and rotator cuff muscles provide crucial stability for heavy bench presses, overhead presses, and rows. This improved stability can help you lift more weight safely and reduce the risk of shoulder impingement.
Equipment And Setup Tips
You don’t need much, but a few considerations can make your workout more effective and comfortable.
Choosing The Right Dumbbell Weight
This cannot be overstated. For back flys, always err on the side of caution. Select a weight that allows you to complete all your reps with strict form and a strong mind-muscle connection. If you’re swinging or using momentum, the weight is too heavy.
Using A Mirror For Form Feedback
Position yourself side-on to a mirror. This allows you to check that your back is flat, your hips are hinged properly, and your arms are moving in the correct plane. It’s a valuable tool for self-correction.
Considering Supportive Gear
While not necessary, some people find weightlifting gloves helpful for grip, especially as hands get sweaty. A weightlifting belt is generally not needed for this exercise as the loads should be relatively light and the core engagement is isometric.
Troubleshooting And Advanced Techniques
If you’re not feeling it in your rear delts, or you want to progress further, try these solutions.
Mind-Muscle Connection Cues
Your brain’s ability to focus on the target muscle significantly impacts its activation. Think about “pulling with your elbows” and “squeezing a pencil between your shoulder blades” at the top of the movement. Visualize your rear delts working.
What To Do If You Feel It In Your Neck Or Traps
This usually indicates you are shrugging your shoulders or using too much weight. Consciously depress your shoulder blades (pull them down) before and during the lift. Lighten the load and focus on the movement originating from the back of your shoulders.
Incorporating Drop Sets And Rest-Pause Sets
To increase intensity without compromising form, try advanced techniques. For a drop set, perform reps to failure with one weight, then immediately grab a lighter pair and continue. For rest-pause, do a set to near-failure, rest for 15 seconds, then do a few more reps with the same weight.
Frequently Asked Questions (FAQ)
What Is The Difference Between Back Flys And Reverse Flys?
There is no functional difference. “Back flys,” “rear delt flys,” and “reverse flys” all refer to the same basic exercise movement targeting the rear deltoids. The name can vary based on personal preference or gym culture.
How Heavy Should The Dumbbells Be For Rear Delt Flys?
Start very light, often much lighter than you think. For most people, beginning with 5, 8, or 10-pound dumbbells is appropriate. The goal is perfect technique and a burning sensation in the rear delts, not lifting massive weight.
Can I Do Back Flys Every Day?
It is not recommended. While the rear delts recover quickly, they still require rest for muscle repair and growth. Training them 2-3 times per week with at least one day of rest between sessions is a more effective and sustainable approach.
Are Dumbbell Back Flys Or Machine Flys Better?
Both have advantages. Dumbbell flys require more stabilization and engage supporting muscles, offering a more well-rounded benefit. Machine flys, like a pec-dec machine used in reverse, provide more isolation and are easier for beginners to learn the movement pattern. Including both over time can be beneficial.
Why Don’t I Feel Back Flys In My Rear Delts?
This is a common issue. The likely culprits are using too much weight, improper form (like straight arms or shrugging), or a poor mind-muscle connection. Go back to basics with very light weight, slow the movement down, and focus intensely on squeezing the back of your shoulders.