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From a surgeon to a Navy SEAL elite team, these actors characters have some of the toughest jobs in the world, but the stars themselves proved they can also survive the grind by completing the infamous Tough Mudder race on Saturday at theGlen Helen Raceway in San Bernadino, California.

Greys Anatomy actor Giacomo Gianniotti, who plays Dr. Andrew DeLuca on ABCs ShondaLand drama, led a team fundraising for My Friends Place, a Los Angeles-based organization which helps homeless youth during their darkest hours.

Gianniotti ran the 11-mile, 25-obstacle race last year with some of his Greys co-stars, and while a fewof them had to drop out this year because of scheduling clashes, they still raised $25,000 this time around, so it just keeps getting bigger and better, he told TheWrap.

Also Read: 'Dancing With the Stars' Alum Noah Galloway Teams Up With Tough Mudder

Originally from Rome, Italy, and more recently Toronto, Canada, Gianniotti saysthat when he moved to Los Angeles, Iimmediately saw that homelessness is a big problem. He began working with My Friends Placeafter being introduced to it by Greys Anatomy costar, Jerrika Hinton.I think its a really important part of being an artist, and knowing withsuccess there is a responsibility to give back, because were very fortunate to be in the position we are, he said.

Edwin Hodge, Juan Pablo Raba, Donny Boaz, Kyle Schmid, Jaylen Moore and Barry Sloane Robert Laberge/Getty Images

Meanwhile, the cast of History Channels SIX (above) Edwin Hodge, Juan Pablo Raba, Donny Boaz, Kyle Schmid, Jaylen Moore and Barry Sloane were literally dropped in at the deep end fortheir first Mudder as they fundraised forGot Your 6.

As Liverpool, England-born actor Sloane said, you run as a team and you finish as a team.

There is nothing individual about it, the former Hollyoaks actor told TheWrap. You are never going to get through it on your own as youve got to literally pull each other over obstacles, but thats part of the charm of it.

Also Read: History's New Slate Includes Marvel-DC Comics Origin Stories Doc 'Superheroes Decoded'

The guys have survivedthe hard-as-nails training for SIX playing SEAL Team Six(one of the U.S. Armed Forces primary counter-terrorism units) so even though they were in great shape, this was no walk in the park.

A lot of the obstacles were similar to the training weve gone through for the show, Sloane, who plays Joe Bear Graves, said of themilitary-training based course.

Also Read: Leonardo DiCaprio to Executive Produce History Channel Documentary 'Frontiersmen'

While endurance wasnt a problem, heights were for Hodge, who admitted he had to take a couple tries to make some of the highest leaps from obstacles such as The King of Swingers (where you have to leap from a 12 foot platform to catch a swing arm and reach with all your might to tap the bell dangling from above).

Gianniotti and his teammates didnt seem fazedby any of the obstacles in the Tough Mudder Half, and even went back to do some of the extra challenges such as the Kongand the Augustus Gloop, admitting that staying in shape is a necessary part of his job.

The 27-year-old didnt even seem out of breath by the end of it and had a (complimentary) beer in his hand even before the mud had dried.

Other notable participants featured in the fourth annual Tough Mudder Los Angeles included YouTube star and The Amazing Race 28 winner Matt Steffanina, and Olympians Jade Jones (2016 Gold Medalist) Ashley McKenzie, Perri Shakes-Drayton, Anthony Fowler and Jessica Varnich.

Season 1 of SIX, which was shot in Wilmington, North Carolina, culminated on March 8. History has sincerenewed the drama for a second season, which will likely premiere in 2018 and will be filmed in Vancouver, Canada.

Greys Anatomy is currently in its 13th season airing Thursdays at 8 p.m. on ABC.

"Grey's Anatomy" is quite possibly one of the most dramatic shows on TV and naturally so are its characters.

We've ranked them from least to most dramatic.

14. Andrew DeLuca

We don't know much about DeLuca other than he dumped Maggie for stupid reasons and was the reason for Alex going to jail.

He's not a very dramatic person, just kinda boring.

13. Nathan Riggs

One of the most calm, collected and chill dudes at the hospital.

Like, seriously does nothing get to him? He's so smooth, charming and SO not dramatic.

Other characters, take note.

12. Stephanie Edwards

Edwards is the neutral point when it comes to "Grey's Anatomy's" dramatics.

She's extra when she needs to be and when the situation calls for it, but for the most part she's pretty level-headed.

11. Owen Hunt

Like Edwards, Owen is also pretty level headed and most of the time, he can serve as a voice of reason -- he didn't even take sides between Webber and Minnick.

Yes, he refused to work with Nathan Riggs, but that's only because he thought he was the reason for his sister's untimely death.

10. Meredith Grey

Honestly, for everything this woman has gone through (her mother's attempted suicide, her father abandoning her and starting a new family, her sister dying, the love of her life passing away, etc. etc. etc.) she's not nearly as dramatic as she's allowed to be.

Meredith has her moments, but for the most part she's pretty chill.

9. Miranda Bailey

Bailey has her freak out moments, but given her circumstances -- running an entire hospital -- she's pretty calm.

Except for that one time she suspended her husband for accidentally killing a lady during surgery, but that's another story.

8. Richard Webber

Dr. Webber is usually the voice of reason on "Grey's Anatomy," but he definitely has his petty moments ... like when he wouldn't give up his throne as the Resident Director -- which was well warranted if we're being frank.

7. Arizona Robbins

Dealing with dying kids and being able to keep a smile on your face obviously means that Arizona can keep calm under pressure, but she definitely has her dramatic moments.

Remember when her leg had to get amputated and she was like ready to kill Callie Torres over it -- even though she pretty much saved her life? Yeah ...

6. Alex Karev

As seen in Karev's most recent run-in with the law, the kid can overreact a tad bit.

But he's just trying to live his life and do right in the world, so we can forget his little dramatic antics here and there.

5. Jackson Avery

We thought Avery was a pretty chill dude, that is until April left him to go serve in the military after they recently lost their child.

He. Would. Not. Let. That. S---. Go.

4. Maggie Pierce

She's like a teenager.

Granted, she is pretty young compared to her colleagues but she literally freaks out over the smallest things and can be really petty at times.

3. April Kepner

Kepner seems like she's always on edge and sometimes cracks under pressure, which is probably why she's always so dramatic.

Woosah, Kepner, woosah.

2. Jo Wilson

Ugh. Sorry, but Wilson is low-key annoying.

She's had a tough life, we'll give her that but she just continues to push away people who love and care about her -- Alex.

1. Amelia Shepherd

Come on ... homegirl is like beyond dramatic.

She wanted to get married to Owen, then ran away on her wedding day, then finally realized she was being ridiculous and they started living happily ever after ... that is until she ran away from her husband again for whatever reason we can't remember because she runs away a lot.

"Grey's Anatomy" is quite possibly one of the most dramatic shows on TV and naturally so are its characters.

We've ranked them from least to most dramatic.

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'Grey's Anatomy' Star Giacomo Gianniotti Gets Filthy for Tough Mudder - TheWrap