Mental fortitude

I had a question about my wiki entry on 'Top 10 marathon racing mistakes' about mental fortitude and if it could be actively developed. I've spent some time thinking about this and I believe that you can train your fortitude in much the same way you can speed or endurance. I've written this up as http://fellrnr.com/wiki/Mental_fortitude and I'm interested in any feedback you might have. (If you like the article, please hit the '+1' button, as I use that to track what articles people find useful.)