The rear delt fly, also known as the reverse fly or bent-over lateral raise, is an isolation exercise that specifically targets the posterior (rear) deltoids. It involves lifting weights out to the sides while hinged at the hips or seated, creating a flying motion that emphasizes the back of the shoulders.
This movement can be performed with dumbbells, cables, resistance bands, or on a reverse pec deck machine. It is essential for balanced shoulder development, as the rear delts are often underdeveloped compared to the front and side deltoids from heavy pressing.
How to Perform the Rear Delt Fly (Step-by-Step Technique)
Strict form and lighter weight are key to isolating the rear delts and avoiding trap dominance.
- Stand with feet shoulder-width apart, holding a dumbbell in each hand with palms facing each other.
- Hinge forward at the hips until your torso is nearly parallel to the floor, keeping a slight bend in the knees and a neutral spine.
- Let the dumbbells hang directly below your chest, arms slightly bent.
- Lead with your elbows and raise the dumbbells out to the sides in a wide arc, squeezing your shoulder blades together at the top.
- Keep your elbows slightly higher than your hands and focus on lifting from the rear delts, not the traps.
- Pause briefly at the peak contraction, then lower the weights slowly back to the starting position.
- Repeat with controlled tempo, avoiding any swinging or shrugging.
Seated or machine variations reduce momentum and are excellent alternatives for stricter form.
Why Do the Rear Delt Fly? (Benefits)
This exercise provides crucial advantages for shoulder health and aesthetics:
- Targets posterior deltoids: Directly builds the often-neglected rear shoulders for complete development.
- Improves shoulder balance: Counteracts front-heavy pressing to prevent rounded shoulders and poor posture.
- Enhances 3D shoulder look: Creates rounded delts visible from the side and back.
- Strengthens upper back: Engages rhomboids, traps, and rotator cuff for better scapular stability.
- Supports injury prevention: Strong rear delts improve shoulder joint integrity and reduce impingement risk.
- Boosts pressing and pulling performance: Better rear delt strength transfers to bench press, rows, and overhead movements.
- Improves posture: Strengthens retractors to pull shoulders back naturally.
Recommended Sets and Repetitions
Rear delt flys respond well to moderate to high reps with strict control.
| Goal | Sets | Reps | Rest Between Sets |
|---|---|---|---|
| Hypertrophy (Muscle Growth) | 3-4 | 10-15 | 60-90 seconds |
| Definition & Endurance | 3-4 | 12-20 | 45-60 seconds |
| Strength | 4 | 8-12 | 90 seconds |
Perform 1-2 times per week, ideally on pull or shoulder days after compound movements.
FAQ (Frequently Asked Questions)
1. What is the difference between rear delt fly and face pull?
Answer: Rear delt flys primarily isolate the posterior deltoids with horizontal abduction. Face pulls add external rotation and more upper trap and rhomboid involvement, making them excellent for posture and shoulder health.
2. Should I perform rear delt flys standing or seated?
Answer: Seated or machine versions reduce momentum and cheating, making them stricter. Standing bent-over allows a greater range but requires more core stability.
3. What muscles do rear delt flys work?
Answer: Primarily the posterior deltoids. Secondary muscles include rhomboids, middle and lower traps, rotator cuff, and some lateral delts.
4. How high should I raise the dumbbells?
Answer: Raise until your arms are roughly parallel to the floor or slightly higher, forming a T-shape. Avoid going too high to prevent trap dominance.
5. Can rear delt flys cause shoulder pain?
Answer: Poor form or too much weight can strain the shoulders. Use light to moderate loads, focus on mind-muscle connection, and stop if you feel pinching.
6. How often should I train rear delts?
Answer: 2-3 times per week is ideal since rear delts recover quickly and benefit from higher frequency to overcome underdevelopment.
7. Are machine rear delt flys better than dumbbells?
Answer: Machines provide constant tension and easier isolation, especially for beginners. Dumbbells offer a freer range and engage more stabilizers.
8. Do I need rear delt flys if I do rows?
Answer: Rows hit the rear delts secondarily, but direct isolation work like flys ensures balanced development and better activation.
