Grinders: Small Circles That Massage Between the Shoulder Blades

The site lists the levator scapulae and rhomboid minor as the muscles Grinders is designed to work. Several muscles sit in the zone between your shoulder blades. The rhomboids pull your shoulder blades toward your spine. The middle trapezius helps keep them steady. The levator scapulae runs from the shoulder blade up to the side of the neck, and the rhomboid minor helps with the small movements in this area.

When these muscles stay in one position for hours, the area can feel tight or heavy. That is a common pattern, not a diagnosis.

There isn't research on Grinders specifically. Here is the closest evidence, about related exercise.

• A 2025 review of specific exercise types found that scapular stabilization exercise, which trains the muscles around the shoulder blade, improved pain and function in people with rotator cuff-related shoulder pain [R03].
• Strength, mobility, body composition and posture are each associated with shoulder pain and disability in adults 60 and over [R28].
• Association is not cause. Gentle movement in this area may be a reasonable part of a plan, but it is not a proven stand-alone solution.

1. Sit tall with support. Sit in a chair with your back supported and your feet flat. Let your arms rest. Take two slow breaths before you start.
2. Make small circles. Let your shoulder blades move in small, slow circles. Keep each circle small enough to stay comfortable.
3. Reverse direction. Repeat the circles in the other direction, at the same gentle size.
4. Rest and check in. Pause and notice how the area feels. Mild effort is fine. Sharp, pinching or lasting pain is a signal to stop.
5. Stand if you prefer. Repeat the same small circles standing, holding a counter for support if you like.