Revealing mistake: While showing the clip of Marshall streaking the first time, you can see thumbnails for videos of him streaking in New York. Those videos were created later that day and could not already be posted. One also shows a woman in yellow and appears to be a retake of the scene. (00:06:15)
How I Met Your Mother (2005)
Episode list - season 9
Starring: Jason Segel, Neil Patrick Harris, Cobie Smulders, Alyson Hannigan, Josh Radnor
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Lucky Penny - S2-E15
Question: I'm confused, what exactly was wrong with Barney's legs in this episode? Why couldn't he move them?
Answer: Barney ran a marathon without any training and over exerted his muscles. While he was able to walk after, later his leg muscles gave out and he couldn't move (or more likely stand). It is not uncommon when one works out too much to be sore the next day, even if they feel okay afterwards. Thus the saying "I'll feel that in the morning."
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Answer: After running the marathon for Marshall with no training, he's allowed to ride the subway for free. While sat on the train, the muscles in his legs start to seize up after the marathon to the point it is painful to move his legs. This is why he can't move them. It's the same reason your body aches after a good session at the gym the day before.
Ssiscool ★