3 Month Prone
for Deep Core Strength & Shoulder Stability
A foundational DNS exercise prescribed by Dr. Dockery to rebuild the deep stabilizing system from the ground up — training the core, shoulder girdle, and breathing mechanics that healthy movement is built on.
What Is the 3 Month Prone Exercise?
The 3 Month Prone is a foundational rehabilitation exercise drawn from Dynamic Neuromuscular Stabilization (DNS), an approach developed at the Prague School of Rehabilitation that uses the body’s own developmental blueprint to retrain stable, efficient movement.
The name comes from a milestone every healthy infant reaches at around three months of age. Lying on their belly, the baby props on their forearms, lifts and centers the head, and draws the shoulder blades down the back — all powered by deep stabilizing muscles working together for the first time. That position is the template for stable posture and shoulder control in adults.
When you recreate it, you teach the diaphragm, deep abdominals, and the muscles around the shoulder blades to coordinate the way they were designed to. The result is a more stable spine, better-positioned shoulders, and breathing that supports the core instead of fighting it.
Step-by-Step: The 3 Month Prone
Set the position
Lie face down with your arms and legs relaxed and resting comfortably on the floor. Let your body settle before you do anything else.
Lengthen the neck
Gently tuck your chin to lengthen the back of your neck, then draw your shoulder blades down and back — away from your ears and toward your back pockets.
Activate the deep core
Breathe deeply into your abdomen and pelvis, expanding 360 degrees around your waistline while keeping your spine in a neutral position.
Hold and breathe
Maintain the posture for several slow breaths, focusing on the quality and control of the position rather than how long you can hold it.
Think “long neck, wide back, full belly.” The whole point is centration — getting joints and muscles into their most stable position. If you feel the work in your low back or the front of your neck instead of your deep core, reset and start the breath again.
Who Benefits From This Exercise?
Athletes
Refines core control and shoulder positioning that carries over into lifting, throwing, and overhead movement.
Desk workers
Counteracts the rounded-shoulder, forward-head posture that builds up over long days at a screen.
Rehab patients
A safe, low-load starting point for restoring stability after a back or neck injury.
What to Watch For
- Cranking the head back. The chin should tuck gently to lengthen the neck — not tilt up, which jams the upper neck.
- Shrugging the shoulders. Let the shoulder blades settle down the back rather than riding up toward the ears.
- Holding your breath. The breath drives this exercise. If you’re bracing and gripping, you’ve lost the stabilizing pattern.
- Arching the low back. Keep the spine neutral; an arched back means the deep core has switched off.
Frequently Asked Questions
Most patients do well with a few rounds of several breaths each, once or twice a day. It’s a quality-over-quantity exercise — a few controlled holds with good breathing beat many sloppy ones.
The name refers to the developmental stage it’s modeled on, not your age. At about three months old, a healthy infant first organizes this prone position using deep stabilizers. DNS uses that natural milestone as a template to retrain the same patterns in adults.
You should feel a quiet, supportive engagement deep in your abdomen and around your shoulder blades. You should not feel strain in your low back or the front of your neck — if you do, reset the position and restart the breath.
It’s often one of the first exercises we use precisely because it’s low-load and spine-neutral. That said, the right starting point depends on your specific situation. If you have an active injury, it’s best to have it prescribed and checked in person first.
Once you can hold the position with relaxed, full breathing, the natural progressions add controlled movement on top of that stable base — exercises like 3 Month Supine with Neck Retraction and the rest of the DNS series in our rehab library.
The video is a great reference, but DNS positions are subtle and easy to compensate through. A quick in-person check makes sure you’re getting the deep stabilizers rather than the muscles already doing too much.
This page is for educational purposes and is not a substitute for individualized medical advice. Consult Life in Motion Chiropractic or your healthcare provider before starting any new exercise.
Want this checked in person?
Dr. Dockery serves patients throughout Livonia, Farmington Hills, Redford, Plymouth, and the greater Wayne County area. We’ll make sure you’re performing the 3 Month Prone correctly and build a plan around your goals.