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Hugh Jackman - He's almost reached the half-century mark, but Hugh Jackman looks better than ever! The actor likes to stay in shape on and off the screen.

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Bella Hadid - The model recently took a boxing class as a way to incorporate some fun in her daily fitness routine.

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Shay Mitchell - The actress is a huge gym fan!

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Drake - This picture is from 2013 and the hip-hop hunk's shape has been improving ever since.

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Henry Cavill - Even Superman has to spend a few hours a day in the gym to achieve his looks!

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Alessandra Ambrosio - Don't get us wrong, the Brazilian model isn't one to go to the gym and stay on her phone all the time... She's actually sharing her fitness tips with her social media followers.

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Drew Barrymore - Drew Barrymore has no issues showing her fans what a true work out face looks like.

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Britney Spears - At the age of 36, the singer is in excellent shape. Her Instagram account is filled with gym pics, where she shares her work out routines.

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Justin TImberlake - JT must work out often to keep up with his busy schedule, but this time, the pop star decided to go for a bike ride near the Hudson river.

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Demi Lovato - Demi takes her exercise routines very seriously, as she often shows on her Instagram.

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Dwayne Johnson - The Rock is known for his fierce love for fitness, which helps him cope with the stress of his incredibly busy schedule. He also gives the best work out tips on Instagram!

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Bar Refaeli - Being at the gym is part of a model's life, and Bar Refaeli sure knows the best work outs.

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Chris Hemsworth - The actor loves to bring his kids to the gym, where they can have fun in family and stay healthy at the same time!

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Kevin Hart - Whether it's for a role he's playing or just for his personal well-being, Kevin Hart loves hanging out at the gym!

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Ellie Goulding - Everybody knows Ellie is obsessed with fitness and well-being. She's even done campaigns with brands such as Nike.

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Gerard Butler - The actor needs to be in shape for most of the roles he plays, which is why he needs to hit the gym frequently.

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Karlie Kloss - The model usually shares her work out routines on Instagram and she's an absolute pro!

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Miley Cyrus - Miley is a yoga fan - as you can probably tell.

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Zac Efron - Zac went for a run with his ex Sami Miro this time, which proved to be useful. Who can forget his incredible beach body on 'Baywatch?'

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Matthew McConaughey - The actor is often spotted by the paparazzi during his morning runs.

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Adriana Lima - Adriana is one of the biggest models in the world, but she's also one of the most down to earth celebrities around. She usually posts pictures of what she actualyl looks like after a work out... sweaty but still gorgeous!

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Lea Michele - Others opt for different exercises - such as Pilates.

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Arnold Schwarzenegger - Arnie has been a hardcore gym rat ever since the 70s, but he also likes to go for lighter activities at times, like going for a bike ride.

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Gordon Ramsay - Chef Ramsay doesn't only burn calories when he's in Hell's Kitchen! The famous chef takes part in marathons all the time.

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Jason Momoa - The Hollywood heartthrob needs to fill up, as it's not easy to look like Aquaman (or Khal Drogo) all the time, right?!

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Justin Bieber - JB also likes to be in shape and his favorite sport is basketball. He was even invited to this year's NBA All-Star Celebrity Game.

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Kate Upton - It really must take a lot of sweat, blood and tears to look like Kate Upton, but the model makes it look easy!

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Khloe Kardashian - Khloe turned her life around when she started taking a healthier approach to her diet and body. She shares fitness tips on her app and social media all the time, and she has her own show 'Revenge Body With Khloe Kardashian,' where she inspires other people to lose weight and eat healthily.

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Sofia Vergara - Sofia Vergara and husband Joe Manganiello are probably one of the hottest couples in Hollywood, but they do work hard for it.

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Zoe Saldana - The actress had to train hard in order to stay in perfect shape for her movie 'Guardians of the Galaxy.'

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Jessica Alba - Jessica Alba is also obsessed with fitness, as her Instagram page will show you.

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Scott Eastwood - The Hollywood hunk wasn't just born like this!

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Will Ferrell - It's not all fun and games for Will Ferrell. The comedian also likes to go for runs and he's took part in some marathons too.

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