David Beckham does push-ups on top of a piano in his underwear -- Watch!

David Beckham is doing push-ups for a good cause.

Over the last three days, Beckham has been participating in the 22 Million Pushups Challenge, which is aimed at veteran suicide prevention. Director Guy Richie, challenged the former pro soccer player to complete the viral video campaign, and Beckham gladly put his own spin on things.

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On Thursday, Beckham completed his daily round of 22 push-ups on top of a piano inside his Las Vegas hotel room while wearing nothing but his underwear.

"It's for a great cause, a serious cause, for all the service men and woman that take their lives every single day," the father of four says after completing his push-ups (without knocking over a bottle of wine and two glasses sitting on the piano).

Beckham then pans the camera to show off his hotel room. "I'm 79 floors up, I'm lying on a piano and I thought I'd bring a pianist with me. I thought you'd find it romantic," he jokes.

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Mr Richie's challenge to myself day 2. @guyritchie

A post shared by David Beckham (@davidbeckham) on

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Each day appears to be a special location for Beckham. He started off the "first lot" of push-ups from 44,000 feet in the air. In his most recent video, Beckham finishes the push-ups in his hotel room, only this time he's fully clothed.

"Day 3 of the#22pushupchallenge to raise awareness of the devastating effects of PTSD on the lives of servicemen, servicewoman & their families," he captioned the third Instagram video. "I won't be posting these everyday so as not to clutter your feed but trust that I will be doing them and you will see the evidence. This cause is too important to me."

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Good morning and hello! It’s great to finally be on Instagram, been a long time coming but I can’t wait to start sharing all my special moments with you. Thank you for all your birthday messages so far. Looking forward to a great day with friends and family x
I feel very spoilt this morning! #DB40
I feel a very lucky man #DB40
Here's a photo with @brooklynbeckham the real boss of the family! #DB40
Happy birthday dad. #DB40
Reached 1 mil on my mums birthday and 2 mil on my dads. Thank u guys so much #DB40
So excited to be spending this special day with David and the kids in Marrakech! Welcome to Instagram @DavidBeckham! x vb #DB40
So excited to be celebrating David's birthday x #DB40 x vb 🎂🎉🎁❤️✈️ x vb
Dinner in Mexico City
Great to see these shy and retiring ladies. Never a dull moment.

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