In which episode of how i met your mother did barney run the marathon?

Season 2, Episode 15, "Lucky Penny":

Ted was late to the airport because he had court in the morning for jumping the turnstyle at the subway. This is when it becomes "Barney's fault." If Ted hadn't had to jump that turnstyle to get to Barney, this never would have happened. We go back to earlier in the day to find out Barney was stuck on the train and couldn't walk, because he had run the NY Marathon that day and lost the use of his legs. We go back even more, to "Marshall's fault" seeing that he was actually the one who planned to run but could not race that day, having broken his toe. He makes a bet with Barney that he couldn't run it, which is barney he does. Then back to "Robin's fault." She walked in on Marshall rubbing his nips after a long run, and he freaks out and breaks his toe. Further back to "Lily's fault," the reason Robin was in the apartment to scare Marshall, was cause she was camped out at a wedding dress sale with Lily. Back even further to "Ted's fault," since no one would have known about the sale if it weren't for him. Why? Because he found a 1939 penny, went across town to make $1.49 profit with it, and treated Robin to a hotdog, which is where she saw the wedding dress sale.

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RE:

In which episode of how i met your mother did barney run the marathon?

Lucky Penny Himym

It was the 15th episode in Season 2...the title of that episode is Lucky Penny :D

Season 2, ep 15. 'Lucky Penny'

^_^

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The pineapple incident :)