The runner, who claims it took three decades for an American to win the marathon since they "don't train hard," recounted an exciting congratulatory phone call he received from President Obama shortly after his win.
"He just called to say he was coming from Air Force One, just wanted to call to say 'how proud I am'... that [my win] couldn't come at a better time, and job well done," Keflezighi told HuffPost Live's Alyona Minkovski in an interview Tuesday.
"I was a little bit nervous," he said of receiving the President's phone call, "but it was a great honor."
In addition to being the first American to win since 1983, the 38-year-old long distance runner is the oldest competitor to land first place in the race since the 1930s.
"I just kept pushing and pushing," he recounted. "I used the crowd to my advantage. They were just chanting USA, USA. Basically, I was probably at Boylston Street, as soon as I took that left turn, I pressed myself and said 'God give me all the strength of the victims and also the crowd' to get me to the finish line, and I was happy to do that."
Watch Keflezigh's full HuffPost Live interview above.