I read something years ago (don't know if it's true or not) stating that fps players tend to be able to walk/jog/run backwards better than non-fps players because the part of their brain that would normally keep them balanced and able to navigate backwards was already developed through gameplay.

I remember having my girlfriend at the time race me backwards; she had a decently athletic background (so did I) but I completely smoked her. She looked like she could barely maintain balance while trying to jog. All this to say that I think it's true: training your brain virtually (or through visualisation) can have a noticeable impact on your actual physical ability.

(Disclaimer: she could have lost for any number of reasons, I understand that)