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The phrase "exert himself" is correct and usable in written English.
You can use it to describe an effort someone is making to do something difficult or challenging, often for a particular purpose or to achieve a particular result. For example: "The student worked hard to exert himself and secure top marks in the exam."
Exact(49)
Man must exert himself as man.
Let's hope he didn't exert himself.
But he did not want to lift, or run, or exert himself intensively.
Before Reyes went to the plate, Howe instructed him to run easily and not exert himself.
And it turned out that only one wanted to exert himself: the married one.
Haywood began to exert himself, establishing the paint as his own.
Similar(10)
He never even looks as though he's exerting himself that much.
(When Armstrong is exerting himself, his heart rate can edge up above two hundred beats a minute).
Exerting himself at high altitude has left his voice a throaty growl.
He exerts himself so much to do simple things and then he's gone.
The thinking was that if the patient exerted himself too soon, the tear would recur.
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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