The president let 11 children of war veterans blow the red sports air horn at the South Lawn of the White House before the riders took off on Thursday. At one point, Obama even pretended to jump when a kid blew the horn.
Vice President Joe Biden tried to get in on the action, but his bid to blow the horn was denied.
The ride, now in its ninth year, aims to help raise awareness of the nation's heroes who battle the physical and psychological damages of war.
Watch the video above.