Exercise guide
Roll Ball Deltoid Posterior
- Intermediate
- Isolation
- Timed hold
- Back
- Shoulders
This isolation exercise targets the posterior deltoid and rotator cuff to improve shoulder stability and posture. By using a ball against a wall, it provides constant tension and feedback for better mind-muscle connection with the rear shoulder.
Reviewed by the Crucible Fit team · Updated June 2026
Muscles worked
Setup
- Stand sideways to a wall with your feet shoulder-width apart and a slight bend in your knees.
- Place a small stability ball or medicine ball against the wall at shoulder height.
- Press the back of your hand or the outside of your forearm against the ball, keeping your arm nearly straight with a soft elbow.
How to do it
- Apply steady pressure into the ball using your rear deltoid to pin it against the wall.
- Slowly roll the ball in small, controlled circles or a vertical 'up and down' motion.
- Exhale as you initiate the movement and maintain pressure; inhale deeply while keeping the core braced.
- Complete the desired repetitions or time on one side before switching to the other arm.
Form checklist
- Keep your shoulder blade pulled down and back; do not let your shoulder shrug toward your ear.
- Maintain a neutral spine and avoid rotating your torso to move the ball.
- Ensure the movement comes from the shoulder joint, not just the wrist or elbow.
- Keep constant outward pressure on the ball throughout the entire range of motion.
Pro tips
- Focus on the 'mind-muscle connection' by imagining you are trying to push the back of your shoulder through the wall.
- Perform the circles slowly—the more control you have over the ball, the more the stabilizing muscles are recruited.
Make it harder
- Increase the range of motion by drawing larger circles or 'writing' the alphabet with the ball.
- Stand on one leg to add a balance challenge and increase core demand.
Frequently asked
- What muscles does the roll ball deltoid posterior work?
- The roll ball deltoid posterior primarily targets the deltoids, and also works the abs, rhomboids, serratus anterior, and trapezius as secondary muscles.
- What equipment do you need for the roll ball deltoid posterior?
- The roll ball deltoid posterior uses stability ball.
- Is the roll ball deltoid posterior good for beginners?
- The roll ball deltoid posterior is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.