Seven-time NASCAR champion Jimmie Johnson finished the Boston Marathon at 3:09:07 on Monday after reaching 1
Johnson wore the number 4848 as a tip of He had his car number – 48 – and finished his 40- to 44-year age group on the 641st place.
The 43-year-old tweeted that it was "the hardest thing I've ever done."
Johnson hoped to break 3 hours, but said he was satisfied with the result.
"I wanted to race, so I ran out of heart rate and time. I came in a bit short, but to make it even better to be as low as possible, I'm really happy, "NASCAR.com reported. Johnson had previously completed a 70.3-mile triathlon and set out to One day he enters the 140.6-mile Ironman Triathlon, often answering alleged fans on Twitter telling him to focus on driving as his performance on the track has declined in recent years.  On Monday, he could not care less about them, as the American long-distance runner Meb is great Keflezighi put a finisher medal around his neck.
"That was so cool," he tweeted.