Keep doing that therapy!!!
After a few weeks of being an invalid, I finally one day decided to drive my Mule up to the mail box. We have a little Rat Terrier who loved to ride on the seat with me. I got it started, put it in reverse, got my foot on the accelerator, and couldn't bend my knee enough to get it off. It goes backwards about as fast as it goes forward! When I finally got it stopped just before hitting a tree, the little dog jumped off, and won't get back on with me to this day.