Neck and Shoulder Stretches for Developers: A 90-Second Routine Between Agent Runs

Watch a developer wait for an agent run and you will see the same shape every time: head pushed forward toward the terminal, shoulders up near the ears, chin out. The wrists are idle, which is why we wrote the sixty-second wrist routine for exactly that gap, but the neck and shoulders are not idle at all. They are holding a position that NHS physiotherapy leaflets name directly as the thing to avoid: poking the chin forward and rounding the shoulders at a computer. This post is the companion routine, ninety seconds for the neck, upper back and shoulders, built from three published exercise programmes with their own hold times and repetition counts, and sized so that it fits between telling Claude Code or Codex what to do and reading what it did.

Where the moves come from

Three sources, all public, none of them ours. Cambridge University Hospitals' Neck exercises and advice leaflet (cuh.nhs.uk/patient-information/neck-exercises-and-advice/) describes head tilts and turns, a chin retraction, an upper trapezius stretch, a scalene stretch and a levator scapulae stretch; it leaves the hold times blank for a clinician to fill in, so we take those from elsewhere. Frimley Health's Head, neck and shoulder stretches leaflet (fhft.nhs.uk) gives repetition counts: shoulder lifts and rolls three to five times, a shoulder blade squeeze held for three seconds and practised three to five times a day, head turns and a gentle chin tuck three to five times at only fifty percent effort. And the Nicholas Institute of Sports Medicine and Athletic Trauma at Northwell publishes an Upper extremity and neck flexibility program (nismat.org) whose rule for every static stretch is hold twenty seconds, rest fifteen, repeat twice more, done once a day, moving in a slow, sustained manner until you feel a pull. Where the routine below gives a number, it is one of theirs.

The 90-second routine

Seated is fine; the NHS leaflets are written for a chair. Keep the shoulders down and relaxed throughout, breathe normally, and go to a pull, never to pain. The order matters a little: the first three moves loosen, the middle three stretch, the last one is the posture reset you carry into the next hour.

1. Shoulder rolls (10 seconds). Arms relaxed at your sides, roll both shoulders three to five times, pause, then three to five times the other way. Frimley Health's leaflet starts here for a reason: it is the move that tells you where your shoulders were.
2. Head turns (10 seconds). Body still, slowly turn your head toward the right shoulder and back to centre, three to five times, then the left. The leaflet says not to turn to your maximum range. Think “look at the monitor on the other desk,” not “look behind you.”
3. Gentle chin tucks (10 seconds). Look straight ahead, draw the chin in so you make a double chin and lengthen the back of the neck, three to five times, using only half your effort. Cambridge's version is the same move described as chin retraction: pull the chin in while keeping the neck and back straight, without tipping the head forward. This is the direct antidote to the forward-head terminal lean.
4. Upper trapezius stretch (20 seconds each side). Bring your chin toward the opposite collarbone without rounding the upper back, then turn the head slightly, and hold for twenty seconds; that is NISMAT's description and hold. Cambridge adds two useful details: grasp the chair with the hand on the stretched side and lean away from it, and do not pull on your head.
5. Levator scapulae stretch (20 seconds each side). Place one hand on top of your head and gently guide it forward and toward the opposite armpit, without pulling; hold the chair with the other hand and lean away until you feel the stretch along the side and back of the neck. Cambridge describes it; the twenty-second hold is NISMAT's standard.
6. Shoulder blade squeeze (10 seconds). Squeeze the shoulder blades together and draw them down your back, hold for three seconds, release; two or three of them. Frimley Health says it should feel easy, not forced. NISMAT's protraction and retraction is the same idea: shoulders forward as far as they go, then back with a squeeze, ten times, if you have the seconds.
7. Posture check (the rest). Frimley's last item is not a stretch: sit tall and use the chair back for support rather than slumping. Cambridge's version: shoulders and back relaxed, neck long and upright, chin not poked forward. Set that before you read the agent's output, because the output is what pulls your head forward again.

Two 20-second holds on each side account for eighty of the ninety seconds, which is why this is a one-set routine rather than NISMAT's three; the agent run is the constraint, not the clinical ideal. On a long run, do the trapezius and levator holds a second time and you are at NISMAT's dose for those two.

What we deliberately left out

No head circles. Frimley's leaflet allows forward-only semicircles with the chin on the chest and says never to tip the head back; NISMAT's half-circles carry the same instruction. A full circle with the head rolled backward is the one neck move all three sources avoid, and it is the one most people do at a desk. Also no doorway pectoral stretch, even though a tight chest is part of the rounded-shoulder picture: NISMAT's chest stretch uses a dowel rod, and a doorway variant is not described in any of the three leaflets, so we are not going to invent one and attribute it to them. If you want it, ask a physiotherapist to show you.

When not to stretch

The leaflets are consistent, and worth repeating because developers tend to treat a sore neck as a hardware issue to work around. Cambridge: stop the trapezius stretch if you feel dizzy; if the exercises are painful, seek advice from a physiotherapist or GP; and it is not safe to drive if pain stops you turning your head. Frimley: stop any exercise that feels uncomfortable or causes pain, and stop the tilts and semicircles at any real pain or dizziness. NISMAT: the exercises should not cause or increase pain; reduce the stretch if it does, and if pain persists, stop and call your physician. Add to that the symptoms the NHS lists for repetitive strain injury in our wrist post, tingling, pins and needles or numbness: if any of those run down an arm when you tilt your head, that is a reason to see someone, not a reason to hold the stretch longer. None of this is medical advice; it is what the leaflets say, and the leaflets say to ask a clinician.

Doing it every run, not every lunch

NISMAT prescribes its flexibility programme once a day, every day. Frimley suggests ten to fifteen minutes daily or whenever you feel tension building, and Cambridge's general advice is to change position regularly, move the neck often, and split computer work into smaller chunks with regular breaks. The problem with all three for a working developer is the trigger: “whenever you feel tension building” arrives about four hours too late, and a timer gets dismissed. An agent run is a better cue, because it is a pause you did not have to schedule and it recurs many times a day. We made the general version of that argument in the post on sitting too long; the neck routine is the most desk-shaped application of it, since nothing here requires standing up.

Where NotchFit fits

NotchFit is the $20 one-time macOS menu bar and notch app for developers who use Claude Code or OpenAI Codex CLI. When your agent starts a task, the MacBook notch expands into a panel with a guided, animated exercise on the left and the AI's live progress on the right; the “Claude is done” and “needs permission” alerts wait until your set ends, every set starts only when you tap Start set, and the whole thing runs locally on macOS 14 or later with no account and no telemetry.

Honesty about the fit: the library holds 239 animated exercises, 198 of them photo animations of real athletes plus illustrated moves, and the weekly plan is written by your own agent with /notchfit:plan in Claude Code or $notchfit-plan in Codex after it asks about your goal, equipment, minutes per day and injuries. We are not going to claim that library contains a move called “levator scapulae stretch” because we have not checked that it does, and the app does not publish its exercise list by clinical name. Treat the seven moves above as a manual add-on: run them in the rest timer between NotchFit sets, or on runs where you have told the plan to go easy on your upper body. What the app contributes is the part the leaflets cannot: the cue that fires every run, the countdown ring, the streak and history heatmap that keep you doing it on day eleven, and the guarantee that the agent's finish alert will not interrupt a twenty-second hold at second twelve. If you would rather use the notch purely as a Claude Code and Codex status panel, the Hide workout toggle does that; on a Mac without a notch, NotchFit shows a top-centre pill instead.

Start with the next run

You do not need the app to try this. The next time the terminal says Claude has started, take your eyes off it, roll your shoulders, turn your head gently each way, tuck your chin, and hold each side of the neck for twenty seconds. By the time you have squeezed your shoulder blades and sat back in the chair, the run is usually waiting for you, and you will read its output from a head that is sitting on top of your spine rather than in front of it.