LOS ANGELES — The photos of J.K. Simmons are not to be believed: Outside of Photoshop or some kind of prosthetic, how does an old guy get guns that cartoonishly huge?

It turns out there’s a bit of an optical illusion at work — a piece of equipment called an “arm blaster” helps flare out the triceps, and the type of workout he’s been doing makes one more temporarily swoll than the average at-home pushup.

But make no mistake, that’s really Simmons, who’s been pumping iron — hard — for more than two years. And man, he is ripped.

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How did J.K. Simmons get so swole? ‘He’s a beast in a whole ‘nother category’