I read it as a poll of difficulty (skill) not toughest (which to me equals arduous or roughest), and even then I think Rugby still rates too low...
anyhow for "toughest": Rugby, rugby league, or Australian Rules Football, should easily be in the top 10.
Any doubts should be led to: The Bledisloe Cup, Wallabies vs. All Blacks (which I just got tickets for this years game), State of Origin: ie. Micheal DeVere in the first origin last year , or the AFL grand final
Tronsky