Carrie Underwood shows off rock-hard abs in bikini selfie

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Carrie Underwood Jumps to Personal Trainer's Defense

Carrie Underwood flaunted her bikini bod on Instagram on Friday, posting a selfie that showed off her rock-hard abs and showcased her new line of swimwear.

"I'm so proud to be able to work with @dickssportinggoods to create a line of swimwear that makes me feel so good!" Underwood, 33, captioned the pic. "Adorable and athletic...and covers everything I want covered! @caliabycarrie #staythepath #summeriscoming #vegas."

WATCH: Carrie Underwood Stands Up for Her Trainer Who Was Bullied and Shamed During a Workout

The country star is staying in red carpet shape for Sunday's Academy of Country Music Awards and next week's American Idol finale. Last month, Underwood's trainer, Erin Oprea, gave ET an exclusive look at how the singer keeps her bod in bikini shape all year round.

More stars in bikinis:

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Spring Break 2016 - Stars in Bikinis
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Carrie Underwood shows off rock-hard abs in bikini selfie
My number one ho
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Happy Saturday. πŸ˜ŽπŸŒ΄πŸ™πŸ» #familytime πŸ’œ@davidbeckham @brooklynbeckham X VB
Adios Mexico πŸ’šβšͺ️❀️
Not in Greece but...
J U N E 1 ✨
Love this @gmilanesi airstream she did for @casamigos in honor of the bohemian artist Amos Ferguson #tacoheaven
Traveling the world is one of the most beautiful things in life. Thank you Brazil for having me and my family, and big thanks to @Airbnb for putting us upπŸ˜˜πŸ˜˜πŸ˜˜πŸ‡§πŸ‡·
"In the summertime when the weather was hot🌞 You can stretch right up and touch the sky🏝 When the weathers fine...." #summer #ready4myvacation
Watching over the bay at the fairmont beach in Barbados
See the light in others and treat them as if that is all you see. -Wayne Dyer #letThereBeLight
They turning up! πŸ‘€πŸ‘€πŸ‘€βœŠπŸΏπŸ˜­
Long Weekend ahead got me like... @constancejablonski 😎 Fin de Semana Largo me tiene...
Camouflaging πŸŒΏπŸƒ worked?
we love our little Gus Gus & we love our @kortnijeane high waisted bottoms πŸ˜»β˜€οΈ 5.26.16
Mixing and matching my favorite pieces from the 5x5 Swim Project with @lspaceswim πŸ’™ Shop this and more on @REVOLVE (available now) #REVOLVE5x5 #REVOLVEaroundtheworld Link in bio!
πŸ’™
Happy sunny day!! Are you guys ready for #aintyourmama video!!??
Lunch break
Bought three new swimsuits today πŸ‘™ This one is my favorite!
So #blessed to be on the #lake with my #family and to have a day off of work! #sisters #saltandpepper @scherzygirl
Χ’Χ›Χ©Χ™Χ• Χ‘Χ—Χ Χ•Χ™Χ•Χͺ πŸ‘™β˜€οΈ Χ§Χ•ΧœΧ§Χ¦Χ™Χ™Χͺ Χ‘Χ’Χ“Χ™ ים Χ‘Χ’Χ™Χ¦Χ•Χ‘Χ™ ! #BARforhoodies
Just beachy
Last minute dip. No bottoms, no problem. #nothingisgonnaruinmyday πŸ‡§πŸ‡ΈπŸ™πŸ½β˜€οΈπŸŒ΄
Bae Watch ! #donthasslethehoff @micahmarcus
Cheers to the (almost) weekend πŸ’ƒπŸ»βœŒπŸ½οΈ trying to figure out what to wear on Kelly & Michael and I'm thinking I'll just go with this look πŸ˜œβ˜€οΈ
In paradise πŸŒ΄β˜€οΈπŸ’‹
He'll be a merman in no time thanks to @thewaterwhisperer #mumlife ✨
@bowie82 and I enjoying some time at the pool before celebrating @samanthapatridge 21st!!!!
Feeling motivated to eat my greens.. πŸ˜‚πŸŒ΄ #SundayFun #SportsIllustrated
Sundays are for hanging around 😎
Girls just wanna have sun πŸ˜œβ˜€οΈπŸŒ΄ #happysaturday πŸ“·: @farrahaviva
Beachin' w the bday girl!
So much fun relaxing this weekend. Monday came right at me like...
Double trouble @stellahudgens #sistasista
Oh hey there :) snapchat bellathornedab 😍😝 #miami #flexfriday #happyfriday #casualfriday #badass #treatyoself #southFlorida #curlyhair
Into the wild 🐯🐯🐯 @victoriassecret #puravida
Go on.
Mama and her ducklings
With my #island baby🌺 @sophialabraham #hawaii #BestHawaiiTripEver @hotmiamistyles #beach #beachbody #summer #beachbunny πŸŒŠπŸŒΊπŸŽ‰βœ¨πŸŒ΄
❀️Paradise........ #Fuchsia #DayDreamin
Happiness
Take me back to the Maldives (+alcohol!) 🐬🌴🐚πŸŒͺπŸ’¦
πŸ‘‘
Dinner with mah babe @cash_warren 🌺#adultspringbreak
My girl craved some vitamin D β˜€οΈ #5months βœ‹πŸΌ
Oh it's a rough day here in paradise it's cloudy oh well just have to make the best of it. 🌴 #poweofpositivethinking
The most beautiful day.. πŸŒΊβ˜€οΈ
just like heaven ...
Look who I found?! 🌴
#Hawaii Time🌺🌊❀️🌴 @SophiaLAbraham #ALOHA 🐒
❀️It feels good to remember who you are before the world told you who you should be........ #Solitude #Authenticity #Clarity
πŸ’€πŸ‘…πŸŒž
Preeeeeety #vacay2016 #thisis41
My Mai Tai is as big as my head. This one is for my Grandmother Sugarplum who loved her "high tides" whenever she was in Hawaii. I think she would have loved this one.
Sisters in Paradise 🌊
This is 14. Omg. 🌴πŸŒͺπŸ‘― #spingbreaking with our friend @ellataitelman and our @mimsygray
Sunday funday!
Just chilling β˜€οΈ
Finally some relax time 😍😘 so happy I had this boy supporting me here :) now headed back to LAπŸ‘™πŸ‘‘@greggsulkin #sxsw #iloveyou #happytuesday #traveltuesday #tan #tot #pool #boyfriend
We are NOT horsing around πŸ˜‚πŸ˜‚ #MLS #sissysquad #plusmom #hydrate
Havin fun in the sun in my @alleaswim 😎 #nofilter #bikini #girls #bffs #happytimes #caligirl #springbreak
Hat game on point! @katherineh82 @marabethpoole #msl #hydrate #sissysquad #plusmom πŸ˜‚
Missing that catamaran life! #noonecallsmecaptainhere πŸ˜žβš“οΈ
Of Course I Couldn't Do It Without The Help Of My Partner In Crime.... #ProudMoment 🐟
She takes #BAYWATCH to another level.. World fell in love with @alexannadaddario in #SanAndreas and I was so impressed by her chops and presence every day, that I had to have her "rep the squad" in our film. Just wait til you see her - and all our girls - kick ass and protect the bay. #GameOver #BaywatchBabes #CoverYourEyesBoys #BAYWATCH SUMMER 2017.
That time I hung out with the @VictoriasSecret Angels… watch me & @ddlovato on #VSSwimSpecial, tonight 9/8c @cbstv
So many beautiful and authentic locations for the filming of The Return of Xander... Blessed.
Left my phone behind to be present! I am so grateful for the people I've met this year but more importantly for the people who have been consistent and by my side through thick and thin. That'd be YOU. Thank you for another year! Love you guys!
Just another manic Monday 😏 @janellehansen
No shoes no shirt no problems 🐳🍍🌴
Happy Happy Birthday to my favorite twins and members of our girl group! 🎈🎈
43 is good... Very good #islandvibes
So long Curacao! Refreshed and ready to see what's next... 🍹🍍🌴🌞🌞🌞
Happy Friday! β˜€οΈ
🌴
πŸ’‹πŸ™ŒπŸ»πŸ˜
My magic πŸ‘ΌπŸΌπŸ’•
#roomwithaview #napa #castlelife #familytime
99 problems but a beach ain't one. πŸ˜‚πŸŒ΄β˜€οΈ I am seriously in #paradise and can't get enough! #maui #badjoke #WestinKaanapali #SiegfriedGetaway #1year
Another view of lovely Savannah
Super casual spa-wear 🌳
Primera vez en una piscina! First time in a pool!
#CoachellaKitty 🎢🌴🐱🌴🎢
😎
Beach Bum 🌴🌞🌴 #Bahamas πŸ‡§πŸ‡Έ
Ride the black swan πŸŽ‚πŸŽ‰πŸŽ‰πŸŽ‰ #bestfriends ever #electrablue
Getting the Tum in the the sun πŸŒžπŸ‘™πŸŒžπŸ‘™
Beautiful Sunday 🌞
If this is wrong I Don't want to be Right.... ✌️ #turksandcaicos #vaca
🌺So much fun on my early bday celebration πŸŽ‚ feeling loved and blessed.
COA... Chilling with my baby boy πŸ’¦πŸŒ΄β˜€οΈπŸ’•πŸ€#coachilling #foreveronvacation #week2 @coachella
So far so good πŸŒ™ πŸ‘ΆπŸΌπŸ‘£
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"Make 10,000 steps a day your goal. A lot of people don't realize how sedentary they are," Oprea explained. "Our bodies are built to move and our bodies hurt because we sit all day, and the more we sit, the more we hurt, and the more we hurt, the less we move, so it's this big cycle you have to break."

See how Underwood adorably helped husband Mike Fisher celebrate his 1,000th NHL game earlier this month in the video below.

WATCH: Carrie Underwood Helps Husband Mike Fisher Celebrate His 1,000th NHL Game

Carrie Underwood and Son Celebrate Dad Mike Fisher's 1,000th NHL Game

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