The part of a sentence "I'm running" is correct and usable in written English.
You can use it in any sentence where you are expressing that you are currently in the act of running. For example: "I'm running late for my meeting, so I'll have to hurry!".
Exact(60)
"I'm running.
I'm running the point.
That's why I'm running".
"I'm running better.
I'm running a business".
I'm running over, actually.
I'm running for office".
I'm running for President.
I'm running here in place.
And that's why I'm running".
"I'm running on adrenaline now".
More suggestions(4)
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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