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Dwayne 'The Rock' Johnson and Zac Efron face off in a tire 'shrugging' contest

This is one burden we're happy to watch these two pumped-up actors endure.
/ Source: TODAY

After a long day of work, most would kick back with a drink and relax. But not Dwayne "The Rock" Johnson and Zac Efron.

Seriously, this did happen, and it wasn't a re-enactment of George Bernard Shaw's "Arms and the Man": As proved by Instagrams posted by Efron and Johnson, after a day of filming the "Baywatch" movie, the pair found a pair of monster truck-sized tires and decided to enter a "shrugging" (aka "flipping") contest. As we all do when we're at the beach, right?

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Let's get Johnson to explain how this all went down:

In this picture, Efron appears to be gaining some traction. But as he notes in his comments, he was not the winner:

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Which, with all due respect, isn't surprising. Efron has bulked up beautifully for his role in the film:

But it's pretty tough to come out on top in a contest of strength and endurance with a man best known as "The Rock," who on his day off is still lifting things most of us can barely look at:

Fortunately, Efron understands what it means when the rubber hits the road, and the men remain not just co-stars, but bros.

We'll never "tire" of you guys!

Follow Randee Dawn on Twitter.