Shoulder Rotator Smash & Floss
The shoulder rotator smash and floss targets the posterior shoulder — infraspinatus, teres minor, and posterior deltoid. These muscles commonly become restricted from desk work and repetitive overhead movements, limiting external rotation and creating impingement risk.
Setup
- Lie on your side with a lacrosse ball placed between the floor and the back of your shoulder, just below and behind the bony point of the shoulder (acromion).
- Use your body weight to create pressure on the ball — adjust by rolling slightly forward or back to find the meatiest part of the posterior shoulder.
- Pin a tight spot and slowly move your arm: reach overhead, across your body, and behind your back. This is the “floss” — moving the arm while tissue is pinned.
- Perform 8–10 arm movements at each position, then shift the ball to a new spot.
- Cover the entire area from the posterior deltoid through the infraspinatus (below the spine of the scapula).
Coaching Cues
What to feel:
- Deep pressure on the muscles behind the shoulder joint
- A stretching or releasing sensation as you move the arm through range
- Referred sensation down the arm or into the shoulder blade area (common with trigger points)
Common mistakes:
- Placing the ball directly on the shoulder joint — keep it on the muscular tissue behind and below the joint
- Tensing the shoulder against the pressure — consciously relax and let your body weight do the work
- Only pinning without moving — the flossing movement is what creates lasting change
- Being too aggressive — if the pain is above a 7/10, reduce pressure by rolling slightly off the ball
Warning
If you feel numbness, tingling, or sharp shooting pain down the arm, reposition the ball. You may be compressing a nerve. Dull, achy pressure is normal; electric or shooting sensations are not.
Video and animated demos coming soon.
Programming
| Parameter | Recommendation |
|---|---|
| Duration | 2 minutes per side |
| Sets | 1–2 per side |
| Frequency | 3–5x per week |
| When to do it | Upper body focus, full mobility session |
Progressions
- Beginner: Tennis ball against a wall (standing) for less pressure. Small arm movements.
- Intermediate: Lacrosse ball on the floor (side-lying) with full arm range of motion.
- Advanced: Lacrosse ball on the floor with a light dumbbell in hand, performing slow internal/external rotation movements under load.