Alex Zanardi appears on the ‘Late Show with David Letterman’

Race car driver Alex Zanardi enters the 'Late Show With David Letterman' taping at the Ed Sullivan Theater on Nov. 5, 2014, in New York City.

Ray Tamarra/WireImage

Alex Zanardi lost both his legs in September 2001 after a motor racing crash at the Lausitzring where the race car driver lost consciousness after suffering from massive blood loss. Despite being a double amputee, Zanardi continues to compete in motor racing events around the world today.

Last month, Zanardi became an Ironman when he completed his first ever triathlon in Hawaii.

“It is fantastic and I will treasure this day in my heart for the rest of my life,” the 47-year-old Italian said after completing the event.

Last week, Zanardi sat down with renowned talk-show host David Letterman to discuss his recent Ironman achievement and reminisce on his first reunion with the doctor who saved his life following the 2001 crash.