Archive · 23 Aug 2026
Chest-Supported Reverse Flys Help Isolate Rear Deltoids
The reverse fly is an exercise for the small muscles at the back of your shoulders.
Using chest support can help keep other muscles from doing too much work.
If your chest falls forward, the rear deltoids may be isolated more effectively.
The rear deltoids can be easily overtaken by larger muscles such as the traps and lats.
This can happen especially when you are not familiar with proper upper-back activation.
Starting with a light weight can help you learn the movement.
Focus on feeling the rear shoulder muscles work instead of lifting as heavily as possible.
The exercise can also teach your shoulders to stay stable while the rear deltoids are working.
Chest support is recommended when performing reverse flys or the reverse pec deck.
Allowing the chest to fall forward can improve rear-delt isolation during the movement.
The exercise is intended to help stabilize the shoulders while working the rear deltoids.
Because the rear deltoids are small and have limited tensile capacity, the traps or lats can take over.
Beginners are advised to use lighter weights and focus on feeling the target muscle work.
- Who
- People performing reverse flys or the reverse pec deck.
- What
- Guidance on using chest support and light weights to better isolate and activate the rear deltoids.
- When
- When first implementing the reverse pec deck or learning the movement.
- Why
- Chest support and controlled, lighter lifting can help prevent the traps and lats from taking over and promote shoulder stability.
- Exercise
- Reverse fly or reverse pec deck
- Target muscles
- Rear deltoids
- Recommended support
- Chest support
- Main challenge
- The traps or lats may take over the movement
- Beginner guidance
- Start lighter than you think you need to
- Training focus
- Find the connection with the target muscle
- Additional benefit
- Teaches shoulder stability while the rear delt is worked