1. Support Your Back
Slide your tailbone as close to the seat back as possible. Aim for a two- to three-finger gap between the back of your knees and the front of your seat. If your vehicle doesn’t allow for the proper position, a lumbar or back cushion may help.
2. Lift Your Hips
If you can, adjust your “seat pan” (the part you sit on) so that your thighs are supported along their entire length and your knees are slightly lower than your hips. This will increase circulation to your back while opening up your hips.
3. Don’t Sit Too Close
You should be able to comfortably reach the pedals and press them through their full range with your entire foot. Safety is also a consideration here; this study suggested that drivers whose chests were closer to the wheel were significantly more likely to suffer severe injuries to the head, neck and chest in front- and rear-end collisions.
4. Get The Right Height
Make sure your seat raises your eye level at least three inches above the steering wheel while allowing sufficient clearance between your head and the roof.