Good sitting posture starts with your pelvis. Most people focus on pulling their shoulders back, but lasting correction comes from setting up your lower body first and then aligning everything above it. The goal is a position where your joints sit at roughly 90-degree angles, your spine maintains its natural curves, and your muscles aren’t working overtime to hold you upright.
Find Your Sit Bones First
Before adjusting anything else, sit on your hands for a moment. You’ll feel two bony points pressing into your palms. These are your ischial tuberosities, commonly called sit bones, and they’re your foundation. When you’re balanced directly on top of them, your pelvis naturally settles into a neutral position, which allows the rest of your spine to stack properly above it.
Most people sit behind their sit bones without realizing it. The pelvis rolls backward, the lower back rounds, and the head drifts forward to compensate. This flattens the natural inward curve of the lower back (the lumbar curve) and increases compressive load on your spinal discs. Over time, sustained lumbar flexion can dehydrate those discs, reduce their height, and contribute to bulges or herniations by starving the tissue of oxygen and nutrients.
To find neutral, rock your pelvis forward and backward a few times while seated, then settle in the middle. You should feel your weight centered on the sit bones rather than on your tailbone. A seat that tilts very slightly forward, with your knees just below hip level, can help pull your pelvis into this position naturally.
Set Up Your Chair From the Bottom Up
Start with chair height. Adjust it so your hips are level with or slightly above your knees, with both feet flat on the floor. Your hips, knees, and ankles should all rest at approximately 90 degrees. If the chair is too high for your feet to reach the ground, use a footrest rather than letting your legs dangle. Dangling feet shift your weight backward and make it harder to maintain a neutral pelvis.
Next, position the lumbar support. It should contact the inward curve of your lower back, sitting just above your hips and below your rib cage. The key is supporting the curve itself, not pressing into the flat of your back or your hips. If your chair doesn’t have built-in lumbar support, a small rolled towel or cushion works. The backrest behind your pelvis should be firm enough to block your hips from sliding rearward. A “slingback” or overly flexible backrest allows the pelvis to rotate backward, undoing everything else.
Position Your Screen and Keyboard
Monitor placement has a direct effect on your head and neck position. The top of your screen should sit at or slightly below eye level, with the center of the monitor about 15 to 20 degrees below your horizontal line of sight. Place the screen 20 to 40 inches from your eyes. Too close and you’ll tense your eye muscles; too far and you’ll lean forward to read, pulling your head ahead of your shoulders.
For your keyboard and mouse, the goal is keeping your wrists straight and your elbows bent at about 90 degrees, close to your sides. Your upper arms should hang relaxed rather than reaching forward or flaring outward. If you use a wrist rest, it’s meant to support your palms between typing bursts. Resting your palms on it while actively typing forces your wrists into an extended angle and overworks the small muscles in your fingers.
Check Your Upper Body Alignment
Once your lower body and workstation are set, your upper body mostly takes care of itself. Your ears should line up roughly over your shoulders, and your shoulders should sit over your hips. Think of it as stacking blocks: pelvis, ribcage, head, each balanced on the one below.
The most common upper-body breakdown is forward head posture, where the chin juts ahead of the chest. This typically happens when a screen is too low, too far away, or when fatigue sets in and you start to slouch. Every inch your head moves forward adds significant extra load to your neck muscles and cervical spine. If you catch yourself doing this, the fix is usually adjusting your monitor rather than just pulling your head back through sheer willpower.
Shoulder rounding is the other common pattern. A simple corrective movement you can do at your desk: gently squeeze your shoulder blades together, hold for one second, release, and repeat ten times. Doing this a few times throughout the day activates the muscles between your shoulder blades that tend to shut off during prolonged sitting. It’s not a permanent fix on its own, but it resets the pattern and reminds those muscles to stay engaged.
Move Before Your Body Reminds You
No sitting posture, no matter how perfect, is meant to be held for hours. Static sitting increases pressure on your lumbar discs over time, even in an upright position. When you sit at 90 degrees, tension builds in the glutes and hamstrings, gradually pulling the pelvis backward and flattening the lower back. The only real countermeasure is changing position regularly.
The World Health Organization reviewed the evidence on breaking up sedentary time and found there wasn’t enough data to set a precise number of minutes. That said, a practical guideline used by most ergonomics specialists is to shift position or stand briefly every 30 minutes. This doesn’t need to be a full workout. Standing up, walking to the other side of the room, or simply shifting your weight and adjusting your seat counts. The point is to interrupt the sustained loading on any single set of tissues.
A Quick Posture Reset You Can Do Right Now
If you’re reading this at your desk, run through this sequence. It takes about 30 seconds:
- Feet: Place them flat on the floor, hip-width apart.
- Pelvis: Rock forward and back, then settle on your sit bones.
- Lower back: Make sure something supports the inward curve just above your hips.
- Shoulders: Squeeze your shoulder blades together gently, then release halfway so they’re back but not forced.
- Head: Pull your chin slightly back until your ears are over your shoulders.
- Screen: Adjust so the top edge is at eye level and roughly an arm’s length away.
- Arms: Let your elbows rest at 90 degrees, close to your body, wrists straight.
This isn’t a position you need to hold rigidly. It’s a home base. You’ll drift away from it, and that’s normal. The goal is recognizing when you’ve drifted and having a reliable way to reset. Over time, the reset becomes more automatic as your body learns to treat this alignment as its default rather than something that requires constant effort.