Read Joanna Gaines' sweet, supportive note to Chip ahead of his first marathon

This Sunday, "Fixer Upper" star Chip Gaines will run his first ever marathon, in what will probably be more of an adrenaline-filled moment than any Demo Day he's ever experienced (and that's saying a lot).

His wife and co-star, Joanna Gaines — who's carrying the couple's fifth child! — is already cheering him on, posting a sweet and supportive message on Instagram Friday night.

"I am thankful for your big heart and big vision," she captioned a photo of Chip running down a wide, empty road. "Go get 'em this weekend, and you better believe I'll be the first in line at the finish to give you the biggest hug!"

Joanna also recapped the story behind the inaugural Silo District Marathon, which the Gaineses are hosting in their hometown of Waco, Texas.

Related: Cutest photos of the couple 

35 PHOTOS
Cutest photos of Chip and Joanna Gaines
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Cutest photos of Chip and Joanna Gaines
Jo is always working.. #LookAtME!!
Tonight's episode is a unique one... Watch us take on a different kind of #fixerupper 9/8c @hgtv #🚣🏻🎣
"We were together. I forget the rest." - Walt Whitman & @jimmydon522 Happy Valentine's Day @joannagaines
On tonight's episode, Chip finally figures out his design style! 😉 It's a dramatic reveal you won't want to miss @hgtv 9/8c
I know it's going to be hard to sleep tonight. I won't be coming down your chimney tonight, or will I? 1 more day. #fixeruppereve is upon us.
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Joanna Gaines attends The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
WHAT!?! 📸@brockwayne
You're my cup of tea @joannagaines! All new episode of #fixerupper tonight at 9/8p CT on HGTV. #season5iscoming 📷: @matsumoto818
We had so much fun. Thanks so much for everyone that came and @johnnyswim for killing it. We should do this every weekend. #nofilter #silobration
We were honored to be able to share our story with @iamsecond Be sure to go catch the video on their website!
Beautiful night at the ballpark with my family.. And big win for the Bears! Congrats @BaylorCoachRod
NEW YORK, NY - DECEMBER 08: Chip Gaines and Joanna Gaines discuss their hit show 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Brook Christopher/FilmMagic)
Y’all have heard me say it before that I’ve created a monster with this woman— I love watching Jo’s dreams come to reality and we are so excited to share this next project with you all! Hint: it's not a baby.
NEW YORK, NY - OCTOBER 19: The Build Series present Chip Gaines and Joanna Gaines to discuss their new book 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Mireya Acierto/FilmMagic)
Last week's Bakery reveal was such a fun one! Watch an all new #fixerupper tonight at 9/8c @hgtv
So much fun this morning on the @todayshow ! Thks for watching!
Watch an all new #fixerupper tonight!! 9/8c @hgtv
THE CHEW - Chip and Joanna Gaines as well as Victoria Justice are the guests on Wednesday, October 19, 2016 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) JOANNA GAINES, MICHAEL SYMON, CHIP GAINES
Happpppy New Year!!! 2017!! #adultonesies @chippergaines
NEW YORK, NY - OCTOBER 19: Joanna Gaines attends The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
Tonight is an all new special episode! It's the season four Clip show- full of out takes, bloopers and behind the scenes footage. You won't want to miss! 9/8c @hgtv
Such a fun night watching the episode with our amazing staff! We love our @magnolia family!! 💚 #magnoliachristmasparty2016
When you're doing an interview with @entertainmenttonight in Central Park and you think you're lookin' cute and then you see this.... Catch it tomorrow! I promise I don't do this the whole time 🙈
After we #silobrate we must eat tortillas and queso at the local Taco C! #idrathereatthansleep
It was windy up here but loved the view of downtown Waco. You see the Silos in the background?! #magnoliasilos #ALICObuilding @chippergaines
Selfies aren't our strong suit 🙈 @chippergaines
Today we got to reveal the bakery to our four favorite people! They loved getting to be on the other side of the canvas and be surprised 😍 #fixerupper
Chip taste tested (stuffed his face) all the final flavors for the bakery today. His personal favorite, the strawberries 'n cream cupcake. 🍓 We are super close to opening the new place! #chiptested #chipapproved #fixerupper 📷: @matsumoto818
Tonight's tiny house was a huge mess. #demoday photo courtesy of @Hgtv @rachel_whyte
Chk us out tomorrow night for our first Fixer Upper clip show! Get a behind the scenes look at our favorite moments, many many outtakes and bloopers. January 1, 9/8pm CST. @hgtv 📷: @matsumoto818
Fun day of filming on the farm 📷: @constance_atton #fixerupper #seasonfour @hgtv
NEW YORK, NY - DECEMBER 08: Chip Gaines and Joanna Gaines discuss their hit show 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Brook Christopher/FilmMagic)
Oh me oh my. Chip getting ready to work the stage at our Magnolia employee Christmas party. #imscared
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Running a marathon was a goal Chip first considered while writing his book, "Capital Gaines," according to Joanna's post. But the idea was taken a step further when he met Gabriele Grunewald (Gabe for short) in New York City last fall.

Grunewald, a professional runner who's been fighting a rare cancer since 2009, inspired Chip, who explained in a January blog post that, after meeting her, he didn't want to spend another second standing on the sidelines.

"Given what she's gone through, I didn't have any excuse not to give this a shot," he wrote. "So I committed."

Grunewald has been helping Chip train from her home state of Minnesota. He's also been getting lots of support and messages of encouragement from his four kids.

Related: HGTV stars before fame 

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HGTV stars before they were famous
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HGTV stars before they were famous

"Rehab Addict" star Nicole Curtis during her high school cheerleading days!

(Photo: Facebook)

No one could rock suspenders like Nicole Curtis!

(Photo: Facebook)

"Fixer Upper" stars Chip and Joanna Gaines look just as in love now as they did back then. This is one of the couple's engagement photos from over a decade ago.

(Photo: Instagram)

Ok, Chip Gaines was quite a looker in his younger days. Anyone else agree?

(Photo: Instagram)

And here's another one from Chip and Jo's wedding day. We want more pictures!

(Photo: Instagram)

Stop the cuteness! The "Property Brothers" stars Drew and Jonathan Scott have grown up into such handsome men.

(Photo: Instagram)

Back where it all started! Drew Scott dressed up and looked spiffy for his high school graduation.

(Photo: Instagram)

The Scott brothers with their infamous third sibling, J.D.

(Photo: Instagram)

We love Jonathan Scott as a scrawny teenager. We don't think he'd be caught in this outfit these days.

(Photo: Instagram)

Daddy's girl! Here's Genevieve Gorder looking totally adorable before going to "Sesame Street Live" with her dad.

(Photo: Instagram)

Genevieve Gorder, host of "Dear Genevieve," was such a cute 7 year old.

(Photo: Instagram)

Carter Oosterhouse, star of "Carter Can," was living his best life in the '70s with some pals.

(Photo: Facebook)

"Flip or Flop" star Christina El Moussa looked just as gorgeous in Jr. High!

Sabrina Soto, star of "The High/Low Project," was all smiles with the Easter bunny.

(Photo: Instagram) 

Josh Temple of "House Crashers" rocked some seriously bleached blonde hair in the '90s!

(Photo: Instagram)

Here is "Property Virgins" star Egypt Sherrod at 15 years old rocking a super red ensemble. Talk about a '90s throwback!

(Photo: Getty)

This photo of Scott McGillivray shows less skin (so seriously what's the point?!) but it did have us feeling nostalgic for frosted tips. 

(Photo: Getty)

Wowza! Scott McGillivray from "Income Property" posted this shirtless photo from back in the day -- and it definitely made his followers happy.

(Photo: Instagram)

I’m extremely lucky to have so many strong, incredible women in my life - including these two... my beautiful mom and my superwoman fiancé, @_lindaphan. ♀️ 💪🏻 #InternationalWomensDay #IWD2018 #TBT
Having been brought up in a loving, supportive household...I’m thankful I was raised to admire and respect women #happyinternationalwomensday #respect #equality #tbt
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All of the profits from the marathon will go toward the Brave Like Gabe Foundation, which aims to help further research on rare cancers like Gabe's.

Joanna added in her post that 6,000 runners from seven countries and all 50 states will participate in the event that will include a full marathon, a half marathon and a 5K.

She ended her Instagram message with hashtag #yourbiggestfan.

Even though Joanna won't be running the marathon, Chip has found ways to cheer her on, too. He was spotted in the TODAY plaza holding a sign that read "I [heart] Joanna Gaines!" while she was discussing her new cookbook on the show.

Good luck, Chip! We're all rooting for you!

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