Posture while sitting.
the short answer: feet flat, knees about level with hips, lower back supported, shoulders relaxed and back, ears over shoulders, screen at eye level, forearms parallel to the floor. the bigger answer: no sitting posture is good if you hold it for hours. position changes matter more than position perfection. moo would like you to stop being so hard on yourself about posture and just stand up sometimes.
search "posture while sitting" and you'll get the same checklist on every page: feet flat, knees at 90, screen at eye level, lower back supported. it's correct. mostly. it's also incomplete in a way that matters, because most people who follow the checklist still have back pain. and the reason they still have back pain is the part the checklist doesn't say out loud.
this piece gives you both halves. the short answer first, because you came here for it. then the bigger answer, which is the part that actually changes how your back feels at the end of the day. moo will be brief.
The short answer
Good sitting posture, the standard checklist.
- Feet flat on the floor. If your chair is too tall and your feet dangle, use a footrest or a stack of books.
- Knees at roughly 90 degrees, about level with your hips, or slightly below.
- Lower back supported. Lumbar curve maintained, not flattened. Use a pillow or lumbar roll if your chair lacks built-in support.
- Shoulders relaxed and back, not hiked up toward your ears and not rolled forward.
- Ears roughly over your shoulders, not jutting forward toward the screen. This is the one most people get wrong.
- Screen at eye level, top of the screen roughly at eye height, so your neck stays neutral.
- Forearms parallel to the floor when typing, wrists neutral, elbows close to the body.
That's the checklist. You can find it on a hundred websites. It's mostly right. If your posture is dramatically worse than this (you're slumped, your chin is six inches in front of your shoulders, your feet are dangling, your screen is in your lap), fixing those things will help.
But here's where the rest of the internet stops, and where this article keeps going.
The bigger answer
No sitting posture is good if you hold it for hours.
The strongest finding from the last decade of ergonomics research isn't that there's one perfect posture you should achieve. It's that any single posture, held for too long, produces problems.
The body wants variety. The muscles that hold you upright fatigue when they work for hours without rest. The discs in your spine, which are nourished by movement (not blood flow), get less nutrition when you sit still for long periods. The hip flexors shorten. The glutes, deprived of their normal job, start to forget what they were for.
Position changes are what your back actually wants. Not perfection. Variety.
This is why ergonomics consultants increasingly talk about "dynamic sitting" instead of "good posture." The idea is that you should be moving slightly all day, not holding a textbook position for eight hours. Lean back sometimes. Sit forward sometimes. Cross your legs, then uncross them. Stand up, briefly, every hour.
The checklist above is still useful. It tells you what a baseline neutral posture looks like, so you have something to return to. But the checklist is the floor, not the ceiling. What gets you the rest of the way is movement.
Three small habits that beat any chair
Shift small, often.
Every 20 to 30 minutes, change something. Uncross your legs. Lean back. Sit up a little taller. Move your screen a quarter-inch. Re-cross your legs the other way. Tiny adjustments, throughout the day, are worth more than nailing a perfect position once and freezing.
Stand up, briefly, every hour.
This is the one that matters most. Sixty seconds of vertical, once an hour. Walk to a window. Refill your water. It resets the entire system. Hip flexors decompress. Spine reloads. Glutes remember they exist. The fact that this is so simple is exactly why nobody believes it works.
Don't make posture a thing you have to think about all day.
Holding rigid attention on posture is exhausting and unsustainable. The better play is to make the environment do the work: a chair with reasonable lumbar support, a screen at the right height, an hourly reminder to stand up. Set the conditions, then forget the conditions and just live.
The relationship between posture and pain
One thing worth being careful about: a lot of internet advice implies that bad posture causes back pain in a simple linear way. The research is more nuanced than that. People with "bad" posture often have no back pain. People with textbook posture sometimes have a lot. The strongest correlation is actually with sitting time, not sitting position.
Translation: if you have back pain, fixing your posture may help, but the more reliable fix is sitting less (more breaks, more standing, more walking). And if your posture is unfixable for some reason (a body that doesn't fit standard ergonomic templates, a chronic condition, anything else), don't despair. The breaks help regardless of what posture you have between them.
A note on chairs
People ask whether they need a $1,500 ergonomic chair. The short answer: probably not. A reasonable chair that adjusts to your body, has lumbar support, and lets you change positions easily is more valuable than a famous-brand chair you sit in rigidly. Spend on adjustability and lumbar support before brand. And remember, no chair fixes the underlying problem of long unbroken sitting. Even Herman Miller hasn't figured that one out, because nobody can.
The cheapest possible chair upgrade is a small pillow behind your lower back, by the way. Try it before you spend $400. Most people who do are surprised.
moo handles the "stand up every hour" part.
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