Karlie Kloss
Another easy yoga morning (or, #fitnessfriday) for this leggy blond beauty.
Khloé Kardashian
The star's daily workouts have contributed to the emergence of her "baby abs," as she calls them!
Sarah Hyland
The actress shared a shot of her post-workout bod to Instagram, alongside a funny caption: "Hard work pays off. I can now perform a full 30 min of a 60 min corepower sculpt class. Hey hey hey. Progress. Shhh. Be quiet."
Kristin Cavallari
The hot mama of two works on her amazing bikini bod during a gym session on Dec. 11: "This just happened. My trainer @michaelsorrentino_ kicked my ass," the star wrote.
Jessica Alba
Alba grins, flexes and bares her pearly whites after a hot yoga session in Los Angeles.
Gigi Hadid
Hadid has been taking to Instagram with fun photos from her high-octave boxing lessons.
Lea Michele
Lea loves her yoga! The actress strikes a Zen pose while getting in her daily workout.
Alessandra Ambrosio
The supermodel mom stretches in the sun during an at-home yoga session.
Idris Elba
Damn Idris! The British actor shows why they say exercise does the body good in a hot Instagram workout vid.
Hilary Rhoda
The Victoria's Secret Angel takes a svelte selfie before her Soul Cycle workout.
Lily Aldridge
The supermodel kicks a leg up after a high energy dance-cardio session at Broadway Bodies in New York City.
Maria Menounos
The star documented a fitness challenge to her Instagram followers back in October.
Justin Bieber
Oh you know, just the Biebs lifting and curling a couple 40 pound weights.
Christina Milian
The singer kicks back with her sister Liz after an intense workout.
Khloé Kardashian
We can tell Khloé takes her booty-busting workouts very seriously: It's all in the results!
Khloé Kardashian
The reality star has been on an Instagram workout kick since this summer when she gained a few sympathy pounds for a then-pregnant Kourtney.
Karlie Kloss
The supermodel gets her fitness on with modelFIT trainer Justin Gelband.
Karlie Kloss
The Victoria's Secret Angel knows how to stretch it out.
Alessandra Ambrosio
The Victoria's Secret model posted this hot shot on Instagram while participating in a SoulCycle class in New York City.
Jessica Alba
The actress has posted a series of healthies on Instagram, documenting her path to an even finer figure.
Gisele Bündchen
The supermodel set our hearts aflutter when she posted this sweet photo of herself and her then 6-month-old daughter, Vivian.
Rosie Huntington-Whiteley
The British beauty posted a photo of a peaceful moment practicing yoga outdoors.
Bar Refaeli
The model starts her morning the healthy way, captioning this yoga-centric photo with, "Can you think of a better way to start the day?? #SpiderWoman"
Chris Pratt
The actor wowed us in July when he showcased his rock-hard physique on Instagram.