Back in the great college days of 2006 we started the Undie Run at SDSU for charity. Since then, we've spread the love to over 100 Universities and Cities in the U.S. and we've even started to expand worldwide. How did Undie Run become so popular? Well, every Undie Run event invitation we've sent on Facebook has been accompanied by a photo of Kyle Kuhlmann in his underwear. The rest is history.