This article is from 2003, and Laura has improved quite a bit since then:
"I began to try to inure myself by getting in a car and riding for five minutes. It would be awful and I would feel terrible. I was so dizzy for an hour afterward, but I just wanted to see: If I keep doing this, can I teach my brain how to tolerate it? I’d go a little longer and a little longer. And over two years, I went from being just miserably dizzy after five minutes to being able to go two hours."
"I began to try to inure myself by getting in a car and riding for five minutes. It would be awful and I would feel terrible. I was so dizzy for an hour afterward, but I just wanted to see: If I keep doing this, can I teach my brain how to tolerate it? I’d go a little longer and a little longer. And over two years, I went from being just miserably dizzy after five minutes to being able to go two hours."
http://stanmed.stanford.edu/2016summer/leaving-frailty-behin...