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Discover LudwigThe phrase "bulk up" is correct in written English.
You can use it when talking about building muscle or gaining weight by exercising and increasing one's caloric intake. For example, "I've been working hard at the gym and eating more in an effort to bulk up my muscles."
Dictionary
bulk up
verb
To gain weight.
Exact(60)
Bulk up on the rescue fund.
She must "bulk up" before chemotherapy begins.
What are you doing to bulk up?
I go meatless on Mondays, so I like to bulk up on Sunday.
Other western rivals like Fiat-Chrysler want to bulk up as well.
This lack of tax may prompt financial sectors to bulk up unhealthily.
"In the private sector you have bolt-ons, M&A, mergers to bulk up," she says.
Shumpert doesn't need to bulk up or lose weight or work on his explosiveness.
Scrapping some of Michigan's many tax credits would bulk up revenues.
As the moment for migration approaches, birds bulk up, adding muscle and fat.
It's hoping to bulk up on high-end feature-packed phones that cost $150 and up.
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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