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The Baywatch hottie looked like he was all about the concentration on back and biceps day.
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Cyrus' time on the yoga mat is definitely paying off in a big way. Meanwhile, we're still mastering downward dog.
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KYLIE JENNER & KOURTNEY KARDASHIAN
No one is better at gym motivation (and reminding you to take breaks!) than a sister.
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The pop princess stays in shape for her Vegas show with some intense in-house yoga.
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"Kinda douchey to post this but my brother made me," Pratt captioned his not-so-shameless gym selfie. Trust us, Chris – no one is complaining.
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The model makes it to the gym even when she's on the road. And she's got amazing fitness advice, like "Go to the gym so you can eat a whole pizza to yourself tonight." Noted.
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Hudson couldn't help but flaunt her skill with the Booty Belt, and we couldn't help but stare for just a little bit.
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Don't mess with Gina! The Jane the Virgin star shows off her tougher side (and bruised knuckles!) after stepping inside the ring with her boxing coach.
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If there's one thing models know, it's how to take a stunning picture, so it's no surprise that Kloss's gym selfies look like something out of a magazine spread.
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What's the real reason the singer spends so much time working on her fitness? So she can "eat more […] Easter Eggs," she explained in her pic (we like her thinking).
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DWAYNE 'THE ROCK' JOHNSON
Looking for some beach body inspiration? Look no further than Johnson's Instagram account for two very big reasons to hit the gym after work.
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It's no easy feat to succeed in the modeling industry, but Dunn has a lot of experience holding a "warrior" pose.
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MICHAEL B. JORDAN
As the Fantastic Four's Human Torch, he bursts into flames, but we're the one's burning up thanks to the actor's steamy shirtless selfie.
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The workout gods must have been smiling on this (Victoria's Secret) Angel because she looks pretty great even after an intense bootcamp workout.
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"Nothing Like Lifting THIS Weight, After Gym:) He Motivates Me To Go Harder," the singer wrote on Instagram of inviting her growing son, Future, to her "body party."
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Bend, and streeeeetch! Also on the Pilates bandwagon, Refaeli has proof the method works. "It may look simple but I wasn't able to touch the floor with the tip of my fingers a year ago... And now..! Magic#pilates," the model shared on Instagram.
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Pop quiz: Which is stronger – Drake's powerhouse vocals or his biceps?
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Even a little sweat (and some workout-earned wear and tear) can't hide the supermodel's glow as she hits the "boxing jungle" in her #healthie.
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Is the basketball star breaking a sweat – or the law? "Somebody call 911," James joked on Instagram. "The weight room just got murdered!"
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The on-the-go model shows off his hot wheels – and even hotter physique.
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Many an admirer has fallen head-over-heels for Huntington-Whiteley – but she's the one turned upside down when she's working out. "My handstand today in yoga!" she wrote.
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