Last week I discussed doing regular body checks. You may be surprised at how hard it is to keep good posture while you drive. Old habits die hard!
One simple thing you can do to force yourself to do body-checks as you drive is to adjust your rear view mirror as soon as you get in to a height where you have to sit up straight to see out of it. Then adjust your seat so that you can comfortably lean into it and also see out of the mirror.
You may be surprised at first about how crooked you sit when you drive. It may feel weird or awkward, but keep with it. Habits can take up to 6 weeks to change with regular awareness. Keep at it…your body will thank you for it.