It would be cool if yoga got popular enough to where somebody designed a car (in particular, the interior seats) with body alignment in mind. I would be first in line to buy the yoga car! Let's see..
It could have a driver's seat that supports tilting the pelvis forward, and sitting up straight. Sitting up straight would require a greater distance between chair and ceiling than my prius has -- I'm much longer when I'm straight!
It could support symmetric driving: driving with either foot, so that the legs and feet get a balanced experience.
The passenger seat could fold back to totally flat, so you can practice yoga postures in there when you're parked and it's too cold to be outside.
And just in case any car manufacturers out there are listening--I'll invest!