In response to the above enquiry.
If the tightness of the muscles is brought on directly by driving the car, then:
(1) THROW AWAY THE CAR!
(2) Take a hot shower and a hot bath after getting out of the car to relax the muscles, or go to the gym and use the gym’s jacuzzi and steam room to relax the muscles. Then drive the car to the junk yard and dump it.
Again, tightness of the muscles after driving in a car is the direct result of the low newfangled driver’s side bucket seat in small cars, repeat, in all small cars!
And who designed the damn newfangled low driver’s side deep spoon-shaped bucket seat ? The Japanese when they first fitted the damn sport style driver’s bucket seats in the 1980s Toyota Supra.