Make sure your back is at a right angle to your thighs.
Keep your thighs at a right angle to your calves. Keep your shoulders straight and squared, your head upright, and your neck, back, and heels aligned.
Check your posture by sitting on your hands.
Put your hands under your sit bones while you are sitting on the floor. Make sure that your palms are facing down. Adjust your position until you can feel the weight centered on each of your palms. This is your optimal seated position.
Adjust your legs and keep your feet flat while sitting.
Your feet should be flat on the floor, facing forward. Don’t cross your legs or ankles. Make your thighs parallel to the floor.
Find a supportive chair to help you maintain good posture.
Use a chair that’s ergonomically designed for proper support, meaning it supports all of your back, even the curve at the bottom. Also, make sure it’s designed for your height and weight.
Adjust your computer monitor to help with your posture.
If you work on computers at an office, angle the monitor slightly upward so that it forces you to sit up.
Make adjustments to your seat to maintain good posture while driving.
Adjust your seat to maintain a proper distance from the pedals and steering wheel. If you’re leaning forward, pointing your toes, or reaching for the wheel, you’re too far away. If you are bunched up with your chin on top of the steering wheel, you’re too close.
Take standing breaks when you’re sitting for long periods.
Even if you’re using perfect posture while sitting, you need to stand up and stretch or walk every hour or so. Just walking around the room or getting out of your car for a few minutes can help.