ERGONOMICS

Typing ergonomics without the folklore

A keystroke takes about 50 grams of force, so no single one can hurt anybody. Six hours of typing is around 100,000 of them, which is why injury from typing is never about strength and always about a posture held slightly wrong for a very long time.

By Hiren Solanki Published 4 September 2026 Updated 2 October 2026

Why typing hurts people

Typing is a very low force activity, which is exactly what makes it a risk. A keystroke takes around 50 grams of force, so nothing about any single one could injure anybody. But somebody typing 60 words per minute for six hours makes on the order of 100,000 keystrokes in a working day. Injury from typing is almost never about load. It is about repetition of a posture held slightly wrong.

Three of those slightly wrong postures do most of the damage, and each has a name that tells you what to change:

• Extension. Wrists bent upward so the fingers can reach over the keyboard. This narrows the tunnel the nerves and tendons pass through at the wrist.
• Ulnar deviation. Hands angled outward at the wrist, towards the little finger, because the keyboard is narrower than your shoulders and your hands have to converge to reach it.
• Pronation. Forearms rotated palms-down and held there. Flat keyboards require the full rotation and give the forearm nowhere to rest in between.

A standard keyboard on a standard desk produces all three.

The setup that fixes most of it

Start with the elbows and work outward, because the arms are where the problem is.

If you only do one of these, lower the keyboard. Most desks are built at around 74 centimetres, which is a good height for writing on paper and around 5 centimetres too high for a keyboard for most adults. A keyboard tray, a lower desk setting, or simply raising the chair and adding a footrest all solve it.

The wrist rest question

Wrist rests are widely misunderstood, and using one the way most people do is worse than having none.

The name is the problem. It is a place to rest your wrists between bursts of typing, not a pivot to plant them on while typing. Anchoring your wrists and reaching with your fingers is how you end up pressing the soft underside of the wrist into a surface while the tendons inside it slide, and it forces exactly the extension you were trying to avoid. While you are actually typing, the hands should float and move.

Split and tented keyboards

These attack the deviation and pronation directly, and once you understand what they are for the strange shapes make sense.

• Split keyboards separate the halves so each hand sits in line with its own shoulder. Your wrists stop angling outward.
• Tented keyboards raise the middle so the hands sit tilted, which partly unwinds the forearm rotation.
• Columnar keyboards put keys in straight columns instead of the rows offset diagonally, which exist only because typewriters needed room for levers.

They work, and they are not a first step. Desk height, keyboard height and tilt are free, take ten minutes, and account for more of the problem than the keyboard shape does. Fix those and then consider spending money.

Technique matters more than equipment

Two habits do real damage regardless of how good your setup is.

Bottoming out hard. Most keys register about halfway through their travel, so driving them into the base plate adds force to every one of your hundred thousand daily keystrokes for no benefit. Learning a lighter touch is the cheapest ergonomic improvement available, and it usually makes you slightly faster as well.

Reaching instead of moving. Stretching the little finger for Enter or Backspace while the rest of the hand stays anchored loads the weakest finger at the end of its range. Move the hand. Correct finger assignment mostly prevents this by giving every key an owner that can reach it comfortably.

Breaks, and what actually helps

Short, frequent breaks help more than long, occasional ones. Tendons and nerves object to sustained positions, so 30 seconds of hands off the keyboard every 20 to 30 minutes does more than one long lunch break.

• Every 20 to 30 minutes: hands off, shake them out, let the arms hang. Half a minute is enough.
• Every 20 minutes: look at something at least 6 metres away for 20 seconds. This is for your eyes, and it costs nothing to do at the same time.
• Every hour or two: stand up and walk somewhere.

These are easy to intend and hard to remember, so tie them to something you already do several times an hour.

Signs to take seriously

Aching muscles after an unusually heavy day are ordinary. These are not, and they are worth a doctor's appointment rather than a new chair:

• Tingling, pins and needles, or numbness in the fingers, particularly the thumb, index and middle.
• Pain that wakes you, or that is worse in the morning than at the end of the day.
• Weakness, dropping things, or difficulty with buttons and jar lids.
• Any symptom that persists for more than a week or two of rest.

The reason to go early is unglamorous but consistent: these conditions are far easier to treat in the first few weeks than after a year of typing through them.