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Two fit friends,Watch Sleeping Beauty Online John Krasinski and Dwayne "The Rock" Johnson, spent Memorial Day working out together for a good cause.

The pals took part in the Murph Challenge, a workout and annual fundraiser in honor of Lt. Michael P. Murphy, a Navy Seal who died during combat in 2005.

The challenge begins with a one-mile run, followed by 100 pull-ups, 200 push-ups, 300 squats, and a second one-mile run. On top of al that, participants are encouraged to wear a 20-pound vest to get the full effect of a Navy Seal workout.

Krasinski shared a video of himself ahead of the challenge where he took the time to thank all the men and women serving the U.S., and to introduce his friend "Dave," also known as The Rock.

"A dude named Dave who works out at my gym who wanted to do it with me," the actor joked, just before The Rock appeared from off frame to say, "Yeah, uh, first of all, it's my gym, and I'm Dwayne."

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"I just want to say what an honor it was to drop sweat in honor of Lt. Mike Murphy," The Rock said in a second post-workout video shared to his Instagram page. "I want to thank brother John for considering me and asking me to do this and thank you brother Chris Pratt for originally having John do it last year."

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Last year, Krasinski and Pratt teamed up for the challenge to honor past and present members of the armed forces. (This year, it appears Pratt was busy filming a Lego motorcycle film.)

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This year The Rock and Krasinski seemed to recover nicely from the challenge, but last year Pratt and Krasinski were noticeably out of breath, shaking, and sweating. Understandable, guys.

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This year The Rock promised he'd invite another special guest to participate in the challenge next Memorial Day, but until then he and Krasinski will be proudly celebrating their workout.

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Nice job, guys!

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