They're so lucky, they are stars, and they sweat, sweat, sweat without a broken heart.

For Hollywood's most famous celebrities, working out is a part of life. Whether bringing a professional trainer to their home or heading out to a top-of-the-line studio, these fit and fantastic stars have access to the best of the best.

For some familiar faces, however, the best resource they can have may just be their significant other.

Earlier this week, Britney Spears shared a selfie from the gym and told fans that she was "staying focused." As it turns out, boyfriend Sam Asghari may have been the extra inspiration she needed to go the extra mile.

"Success is earned, not given, Just like respect," the model shared on Instagram. "Most people demand both without paying the price for it. Do the work, trust the process, enjoy the progress."

Britney Spears, Fitness

Instagram

Ever since Jennifer Lopez and Alex Rodriguez became a couple, the pair has been hitting up various gyms across the country.  "We work out together all the time," the former New York Yankees baseball player shared with us. "She is a fitness enthusiast and she's a much better athlete than me."

And after Beyoncé and Jay-Z welcomed twins, the pair was spotted on multiple occasions at SoulCycle classes around town.  

With fitness on the mind, we decided to take a look at the couples who are staying fit together in our gallery below

Britney Spears, Sam Asghari

Arun Nevader/Getty Images

Beyonce, Jay Z, Anniversary

Beyonce.com

Jennifer Lopez, Alex Rodriguez, Fitness

Instagram

Gabrielle Union, Dwyane Wade, Fitness

Instagram

Khloe Kardashian, Tristan Thompson

CMaidana / RAAK / BACKGRID

Leslie Mann, Judd Apatow

Freddie Baez/startraksphoto.com

Heidi Klum, Martin Kristen, Bodyguard

Jason Webber/Splash News

Renee Zellweger, Doyle Bramhall

AKM-GSI

Andrew Garfield, Emma Stone

Rocstar/CPR/FAMEFLYNET PICTURES

Channing Tatum, Jenna Dewan

AKM Images/GSI Media

Rebecca Romijn, Jerry O'Connell

Eric Brogmus/INFphoto.com

Matthew McConaughey, Camila Alves

INFphoto.com

Perhaps hitting the gym doesn't have to be a chore at all.

As the athletic Britney sings in her hit single, now get to work bitch! 

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