How to Sit Properly at a Desk

“Sit up straight” is terrible advice — not because it's wrong, but because it's vague and exhausting. Proper sitting posture isn't a rigid military position; it's a stacked, supported, relaxed alignment your body can sustain. Here's exactly what it looks like, how to set up your desk to make it easy, and how to keep it past 9:15 am.

The correct sitting posture, from the ground up

1. Feet: flat on the floor (or a footrest), not tucked under the chair or crossed.
2. Knees: bent about 90°, level with or slightly below your hips.
3. Hips: pushed all the way to the back of the chair — sitting on the front edge guarantees a slump.
4. Lower back: supported by the chair's lumbar curve or a small cushion; keep its natural inward arch.
5. Ribs over pelvis: tall through the torso without puffing the chest.
6. Shoulders: relaxed, down and gently back; elbows near 90°, close to your body.
7. Head: level, ears over shoulders, eyes on the top third of the screen.

Desk setup checklist

• Monitor: arm's length away, top third at eye level. Too low is the most common slouch trigger.
• Laptop: on a stand (or a stack of books) + external keyboard and mouse. A laptop flat on a desk makes proper posture physically impossible.
• Keyboard & mouse: close enough that your elbows hang at your sides; wrists straight.
• Chair: height so feet sit flat; lumbar support at your lower-back curve; armrests just supporting relaxed shoulders.
• Phone: raised to eye level when you use it — otherwise you're rebuilding text neck during every break.

The part nobody tells you: perfect posture isn't the goal

Ergonomists like to say “your best posture is your next posture.” Even ideal sitting becomes a problem when held statically for hours. The real goals are:

• Return often to good alignment — you'll always drift; drifting is fine if you keep coming back.
• Change position regularly — micro-shifts, plus properly standing up every 30–60 minutes (see how often to stand up).

Both of these are remembering problems, not knowledge problems. Which is why the highest-leverage ergonomic tool isn't a $1,500 chair — it's a reminder.