Why? Because I was failing NAPFA's running portion, and desperately didn't want to join NS three months earlier. I read a news article that claimed that Viagra improved athletic performance by enlarging your blood vessels, allowing your heart to pump more oxygen and increasing stamina. At the time, it sounded like what I needed. Turns out... it didn't really work. Well, my running time improved by 10-20 seconds, but it wasn't enough to pass. With such a small improvement, I couldn't really chalk it up to the Viagra.