Quick Answer: Full overhead reach requires roughly 180 degrees of shoulder flexion, and a substantial portion of that comes from the shoulder blade rotating on a mobile ribcage plus thoracic spine extension. If your ribs flare forward to create the range instead, you get the appearance of overhead position by extending your lower back. Test it lying down with your lower back flat - if your arms will not reach the floor in that position, the restriction is rib and thoracic, not shoulder.

You have stretched your lats every day for two months and your overhead position has not changed.

That is because you have been stretching the thing that was not stopping you.

The test that tells you which it is

Lie on your back with knees bent and feet flat. Flatten your lower back against the floor so there is no gap under it, and hold that. This removes the lumbar extension that normally disguises the problem.

Now raise both arms overhead, keeping the elbows straight and the lower back flat. If your arms reach the floor comfortably, your overhead range is genuinely available. If they stop short, or your ribs lift off to get there, you have found the restriction.

Most people are surprised by how far short they fall, because standing overhead reach is achieved by arching the lower back, which the body does automatically and unconsciously.

Do the same test against a wall standing up, with your heels, hips, upper back and head against it and the lower back pressed flat. Same result, easier to check in a mirror.

The distinction matters because the fix is different. A true shoulder restriction responds to shoulder work; a rib and thoracic restriction does not, which is why months of lat stretching produce nothing.

Why the ribcage is involved at all

The shoulder blade has to rotate upward for the arm to go overhead, roughly 60 degrees of it, and the shoulder blade sits on the ribcage. If the ribcage is positioned poorly, the blade cannot rotate through its full range regardless of how mobile the shoulder joint itself is.

Thoracic extension contributes directly. The upper back needs to extend to allow the last portion of overhead reach, and a stiff thoracic spine caps it early.

Rib position is largely a function of breathing and posture. A chronically elevated, flared ribcage - common with desk work and with shallow upper-chest breathing - holds the thoracic spine in a position that limits both extension and scapular rotation.

Which is why breathing drills appear in mobility programs and confuse people. Exhaling fully draws the ribs down and back, restoring the position the shoulder blade needs to work from. It is mechanical, not mystical.

And it explains the compensations. When the range is not available at the ribs, the body borrows it from the lumbar spine, which is why an overhead press so often turns into a standing back arch.

What to do about it

Start with a full exhale drill. Lying on your back, knees bent, exhale completely and feel the ribs draw down, then hold that position for two or three seconds before inhaling. Five breaths, before any mobility work. This alone changes the wall test result for many people.

Add thoracic extension over a foam roller, placed across the upper back with hands supporting the head. Extend over it slowly for eight to ten repetitions, moving the roller to two or three positions between the shoulder blades. Keep the ribs down and do not let the lower back arch.

Then train the range you just gained, which is the step almost everyone skips. Wall slides with the lower back flat, or a light overhead press with a strict rib-down position, tells your nervous system the new range is usable.

Prone or half-kneeling overhead work is easier to control than standing, since it makes it much harder to cheat with the lower back.

Do it daily rather than in long sessions. Five minutes every day outperforms thirty minutes twice a week for anything mobility-related, and this is no exception.

Retest weekly with the same wall test, which takes ten seconds and tells you whether the work is doing anything.

What Nobody Tells You About Overhead Mobility

Some restriction is structural and will not change. Bone shape at the shoulder varies between individuals, and a proportion of people will never achieve a full overhead position regardless of training. That is anatomy, not a failure of effort.

Gains fade faster than strength does. A week off degrades mobility noticeably while strength holds, which is why mobility work needs to be a daily habit rather than a block you complete.

Stretching alone rarely holds. Range gained passively without being trained under load tends to disappear within days, because the nervous system does not consider it available. End-range strength work is what makes it stick.

The overhead position looks different at different weights. A range you can access unloaded may not be available under a loaded barbell, which is a strength and control issue rather than a mobility one.

If pain is part of the picture, this is the wrong article. Pain with overhead reach - particularly a painful arc, night pain, or weakness - warrants assessment rather than more mobility drills. This is general information, not medical advice.

And working overhead is not compulsory. Landmine presses, incline presses, and angled pressing variations train the same muscles without demanding a range you may not have. Working around a limitation is a legitimate choice, not a compromise.

FAQ: Ribs and Overhead Range, Answered

How do I know if my ribs are flaring?

Lie on your back with your lower back flat and raise your arms. If the front of your lower ribs lift away from your torso as the arms go up, that is rib flare taking over.

How long until the wall test improves?

Many people see a change within two to three weeks of daily work. If nothing has moved in six weeks, the restriction may be structural or may need in-person assessment.

Should I still stretch my lats?

If the lat is genuinely restricted, yes - the test tells you. It is just rarely the whole story on its own.

Is rib flare a posture problem?

Partly, and partly a breathing pattern. Both respond to the same exhale-focused work.

Can I press overhead if my range is limited?

A landmine or angled press keeps the training without forcing a range you do not have. Forcing it by arching the lower back is what to avoid.

Does this change with the seasons?

Indirectly - people move less and sit more as the weather cools, and thoracic stiffness tends to track that. Daily five-minute work is what holds it through the change.

TL;DR:

• Test lying down with the lower back flat: if your arms will not reach the floor, the restriction is rib and thoracic, not shoulder.
• The shoulder blade rotates on the ribcage, so rib position caps overhead range regardless of shoulder joint mobility.
• Full exhales draw the ribs down and often change the test result immediately; thoracic extension over a roller adds the rest.
• Train the new range with wall slides or strict light pressing, or it fades within days.
• Five minutes daily beats thirty minutes twice a week, and mobility gains decay faster than strength.

Painful overhead reach needs assessment rather than more drills. Landmine and angled presses are a legitimate way to train around a limit.