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The phrase "running a marathon" is correct and usable in written English.
You can use it anytime you are referring to an event of running a long-distance race. For example, "My goal this year is to run a marathon."
Exact(60)
Running a marathon.
"It's like running a marathon.
She's thinking about running a marathon.
Running a marathon is many things.
I should be running a marathon quicker than that pace".
No one ever said running a marathon is easy.
That would be like me running a marathon.
"It's like running a marathon," Mr. Velasco said.
I just can't see them running a marathon without me".
[Long beat.] I thought running a marathon was hard.
If you missed it, I'm running a marathon — for charity!
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com