Proper sitting posture means keeping your spine's natural curves supported while you sit, with your feet flat on the floor and your head balanced over your shoulders. Your lower back rests against the chair or a small cushion. Your knees bend at about 90 degrees, at or just below hip level. Your shoulders stay relaxed, and your elbows rest close to your sides. The top of your screen sits at or slightly below eye level. No single sitting position suits everyone, so small changes within these ranges are fine. Even a good posture needs breaks: stand up and move at least every 30 to 60 minutes.
Below: the 8-step checklist, how to set up your desk and chair, how to sit on a couch or in a car, how often to move, 5 desk stretches and when to see a doctor.
Key takeaways
- Proper sitting posture keeps your lower back supported, your feet flat and your head over your shoulders.
- Set the top of your screen at or slightly below eye level, 20 to 40 inches away.
- Stand up and move at least every 30 to 60 minutes, even when your posture is good.
- See a doctor if back pain lasts a few weeks or comes with numbness or weakness in both legs.
Proper sitting posture: the 8-step checklist
To sit with proper posture, work from your feet up to your head, then set your screen and arms.
- Feet flat on the floor. Rest both feet flat, with your ankles in front of your knees. If your feet don't reach the floor, use a footrest.
- Knees at or just below hip level. Bend your knees to about 90 degrees. Leave a gap about three fingers wide between the back of your knees and the front of the seat.
- Hips back in the chair. Sit with your bottom against the backrest and your thighs roughly parallel to the floor. Keep the angle between your back and your hips at 90 degrees or slightly more.
- Lower back supported. The chair's lumbar support should sit in the inward curve of your lower back. If your chair doesn't fit that curve, a small back pillow or cushion can fill the gap.
- Shoulders relaxed. Let your shoulders sit low and loose, not hunched up, rounded or pulled back. Keep them stacked over your hips.
- Head over your shoulders. Keep your head level and in line with your spine, without tilting it back or letting it hang forward. If your head often drifts in front of your body, our guide on how to fix forward head posture covers the exercises and habits.
- Screen at or slightly below eye level. Place the screen directly in front of you, 20 to 40 inches from your eyes, with the top line at or slightly below eye level.
- Elbows bent, wrists straight. Keep your elbows close to your body, bent between 90 and 120 degrees. Your wrists stay straight and in line with your forearms.
Cleveland Clinic notes that there's no such thing as perfect posture. Use the checklist as a starting point, then check in on your posture every so often instead of holding it rigidly all day.
How to set up your desk and chair
To set up your desk for good sitting posture, adjust your chair to your body first, then bring the desk, screen and keyboard to you.
| Part | How to set it |
| Chair height | Feet flat and thighs about parallel to the floor. You should be able to slide your fingers under your thigh at the front edge of the seat. |
| Seat depth | With your bottom against the backrest, a clenched fist should fit between your calf and the seat edge. |
| Backrest | The lumbar support sits in the curve of your lower back. Add a cushion if there's a gap. |
| Armrests | Set them to lift your arms lightly at the shoulders. |
| Desk height | Your elbows form about a 90-degree angle on the work surface. |
| Screen | 20 to 40 inches away, top at or slightly below eye level, center 15 to 20 degrees below eye level. |
| Keyboard and mouse | Close together, so you don't have to reach. |
| Phone | Use a headset for long calls. |
If you use a laptop for long stretches, raise the screen to the height in the table and use a separate keyboard and mouse. Bifocal wearers should set the screen so they don't tilt their head back to read it.
How to sit on a couch or in a car
On a couch or in a car, the same basics apply: support your lower back, keep your head over your hips and take breaks.
On the couch
Keep your head centered over your pelvis, says orthopedic surgeon Dr. Rahul Shah. A good couch height lets your knees bend at about 90 degrees with your feet flat on the floor. If your feet don't reach, rest them on an ottoman. A very soft seat that you sink into no longer supports the curves of your spine. A supportive pillow behind your lower back can help keep its natural curve. Place the TV within 15 to 40 degrees of your horizontal eye line, and get up every 30 minutes to an hour.
In the car
Put a small pillow or rolled-up scarf between your lower back and the seat. Sit with your breastbone at least 10 inches from the steering wheel, but not so far back that you have to reach. Keep your hands on the sides of the wheel, at 9 and 3. Shift your position slightly every 15 to 20 minutes. On long drives, take at least a 15-minute break every 2 hours, or every 30 to 60 minutes if you're prone to back pain. Heated seats can add some warmth if that feels good.
How often should you get up from sitting?
Get up and move at least every 30 to 60 minutes, even when your posture is good. Sitting still for long periods isn't healthy, even in a good position.
- Every half hour: UCLA Health's spine team suggests standing, stretching and walking for a minute or two.
- At most every 50 minutes: CCOHS advises not sitting for more than 50 minutes at a time.
- Every hour: Harvard Health suggests moving every hour, for example to get a drink of water.
Research supports breaking up long sitting. In a study of 7,985 US adults aged 45 and older, longer unbroken stretches of sitting were linked to a higher risk of death. The authors suggest reducing and interrupting sitting time. In a small trial of 11 adults, 5 minutes of light walking every 30 minutes lowered blood sugar and blood pressure, compared with 8 hours of unbroken sitting.
5 simple desk stretches to do between sitting sessions
The 5 stretches below need no equipment and fit into a short break. Move gently and stop if a stretch hurts.
1. Chin tucks
Sit tall and glide your head straight back, keeping your eyes level, then relax. Our chin tuck guide has the step-by-step technique.
2. Shoulder shrugs and rolls
Lift your shoulders toward your ears, then roll them back and down. For the muscles across the top of your shoulders, try these trapezius stretches.
3. Neck turns and tilts
Slowly look down, tilt each ear toward the same shoulder and turn your head to each side.
4. Doorway stretch
Stand in a doorway with your forearms on the frame and step forward gently until you feel a stretch across your chest.
5. Calf raises and ankle pumps
Stand and rise onto your toes, or point and flex your feet while seated.
If your lower back feels stiff after a long day at a desk, these lower back stretches are a good next step.
At the end of a long sitting day, some people like to lie down at home and unwind. The Thera Back Pillow is a lumbar pillow with traction, heat and vibration, and the recommended session is 30 minutes. It's an optional comfort aid for resting at home.
A lumbar pillow with traction, heat and vibration for winding down at home.
$99.00When to see a doctor about pain from sitting
Some symptoms need a doctor, even if they started after a long day of sitting.
See a doctor if
- Your back pain hasn't improved after a few weeks of home care, stops you doing day-to-day activities or is worse at night.
- It comes with unexplained weight loss, or a lump, swelling or change in the shape of your back.
- The pain is severe and starts suddenly or gets worse quickly, or you feel hot, shivery or unwell. Get an urgent appointment.
- You have pain, tingling, weakness or numbness in both legs, loss of feeling around your genitals or bottom, bladder or bowel changes or chest pain. Call 911 or go to the emergency room.
Sitting posture is one part of back health. Read more about how poor posture can lead to back pain over time.
This article is for general information and isn't medical advice. Talk to your doctor or a physical therapist before starting a new exercise routine, especially if you have an injury or a health condition.
FAQ
Is it better to sit up straight or lean back slightly?
Either can work if your back is fully supported. OSHA lists upright sitting and reclined sitting, with your back reclined 105 to 120 degrees from your thighs, among its neutral postures. Avoid any position that leaves your back unsupported.
Is it bad to sit with your legs crossed?
Crossing your legs for long periods isn't recommended. MedlinePlus and Medical News Today advise against crossing your legs or ankles. If you do cross them, CCOHS suggests switching which leg is on top.
Can bad sitting posture cause back pain?
Bad sitting posture can contribute to back pain, especially if you stay in one position for a long time. Cleveland Clinic notes that posture is only one factor, alongside how much you stretch and move.
What is the best sitting position for lower back pain?
No single position is best for everyone. Start with a supported lower back, feet flat and knees at about 90 degrees. Harvard Health suggests a lumbar pillow and moving every hour. If the pain hasn't improved after a few weeks, see a doctor.
Sources
- Cleveland Clinic, "Posture: What It Is & Why It Matters for Your Health" (medically reviewed; last updated 18 Oct 2023). https://my.clevelandclinic.org/health/articles/posture (accessed 11 Nov 2026)
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- Canadian Centre for Occupational Health and Safety (CCOHS), "Working in a Sitting Position - Good Body Position" (last revised 28 Sep 2022). https://www.ccohs.ca/oshanswers/ergonomics/sitting/sitting_position.html (accessed 11 Nov 2026)
- US Occupational Safety and Health Administration (OSHA), "Computer Workstations eTool: Positions." https://www.osha.gov/etools/computer-workstations/positions (accessed 11 Nov 2026)
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