Nothing will slow you down or stop you like heat and humidity.
http://us.rd.yahoo.com/dailynews/rss/search/cycling+racing/SIG=12afel9ra/*http%3A//www.runnersweb.com/running/news/rw_news_20060609_USAT_Heat.html
http://us.rd.yahoo.com/dailynews/rss/search/cycling+racing/SIG=12afel9ra/*http%3A//www.runnersweb.com/running/news/rw_news_20060609_USAT_Heat.html