Sexy Shirtless Stars!

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Zac Efron

Efron was photographed filming Mike and Dave Need Wedding Dates in Oahu, Hawaii, in June 2015, with his sculpted abs and bulging biceps on full display. "I could pick up almost anything," Efron previously told Men's Health. "If you put it in front of me, I could always find a way to tackle it. I was never a natural at anything, but I could always outwork everybody."

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Hugh Jackman

Ripped and ready! The X-Men actor showed off his sizzling hot body in Honolulu in April 2015 — and he worked hard for that body. “There’s no point in just bulking up,” Jackman told Men's Fitness. “Because you’ve got to be functional.” Instead, the actor opts for hard exercises, sans machines. "I got in the best shape I’ve ever been in."

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Josh Duhamel

Fergie is a lucky lady! The Safe Haven hunk hit Palm Beach in May 2015, where he showed off his ridiculous set of pecs and abs.

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Adrian Grenier

The Entourage actor thinks variety is the spice of life! "I like to change it up. I try to exercise three days a week," he told the L.A. Times. "Lately, I've been doing high-intensity interval training. I'm really getting into running and lifting weights. Now and then, I'll work with a trainer. One of the privileges of living in New York is walking. And exercise makes me feel good."

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Justin Bieber

According to Men's Health, the pop superstar lifts five times a week in 45 minute sessions. He uses a three-day body-part-split, divided into back and triceps, chest and biceps, and legs and shoulders. His cut abs, meanwhile, are worked and shaped every other day.

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Matt Bomer

Move over, Mike! The Magic Mike XXL actor stepped out in Maui, Hawaii, in May 2015, with his too-perfect physique. In an interview with Nightline in June 2015, Bomer confessed his diet was no fun. "When we hadn't had any carbohydrates in a couple of months, and we were starting to fall out in a take, we could at least find solace in each other," he shared.

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Miles Teller

Fantastic figure! Teller trained with Freddie Roach, who has also worked with Manny Pacquiao, for his role in Bleed for This. "His gym isn't too far from me," Teller previously told Us Weekly. "He pushed me hard. I've been on a diet plan, [and] have been counting every calorie."

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Chris Pratt

The Guardians of the Galaxy hunk (pictured here in Kona in April 2015) dropped close to 60 pounds in six months for his role in the action flick in 2013. According to his personal trainer Duffy Gaver, Pratt was so dedicated, he even did extra workouts beyond what was planned. "Chris' athleticism is amazing, he is incredibly disciplined and his work ethic is phenomenal," Gaver told Men's Fitness. "He isn’t the client you have to push; He is the type of client you have to pull down. If you were to walk into the gym when he was training, you would have thought for sure you’ve got a guy getting ready for the NFL Combine."

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Luke Perry

Brenda and Kelly would approve! Beverly Hills, 90210 alum Perry was photographed shirtless during a trip to Bora Bora in May 2014, looking very much like his younger self.

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Paul Rudd

"When I'm not working, I won't shave or cut my hair or exercise," Rudd previously told Men's Journal in a June 2007 interview. But when he's working? Watch out world. The Ant-Man actor showed off his buff physique while playing football—shirtless—in Cabo, Mexico in April 2014.

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Hayden Christensen

Rachel Bilson's beau showed off his lean physique while enjoying a dip in the ocean in Barbados with his pregnant girlfriend in July 2014.

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Bradley Cooper

Why, hello there! The Hangover actor obliged his fans by showing off his muscular beach body during a May 2013 seaside outing in Ipanema Beach in Rio de Janeiro.

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Matthew McConaughey

"It's no fun to sit down and talk about what exercise has to do with life," McConaughey reflected to Men's Health. "But I thought if we found it through some sort of path… go drip that sweat, run until we're fatigued, to where the mind can't ponder the past or the future, well, then you've got something."

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Channing Tatum

"Truthfully, this is how I approach my workout," the 21 Jump Street star previously told British GQ. "I want to be the best athlete I can possibly be. If I can outperform some of the better athletes then I'm happy. When I look at the NFL or the NBA, these guys look how I want to look—it's useable, functional muscle."

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Brody Jenner

Surf's up, bro! Bruce Jenner's son impressively showcased his abs and bulging biceps while enjoying seaside activities with his famous family in Thailand in April 2014. "I try to get to the gym as much as I can," Jenner told Seventeen. "I'll run at the gym, but I don't do a lot of lifting. I never went to the gym much before because I lived in Malibu and I used to surf every day. But now that I live in Hollywood, it’s a pain to drive to Malibu to surf."

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Ryan Reynolds

Lucky, Blake Lively! The Green Lantern hunk stripped down for one fun Independence Day with his wife. Reynolds, who's actually a self-proclaimed workout addict, has focused on maintaining his hot body with diligence, focus, and consistency.

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Leo DiCaprio

Best summer ever! The Wolf of Wall Street star sported a man bun and stripped down shirtless while enjoying a vacation in Bora Bora in April 2014 with his supermodel girlfriend Toni Garrn.

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Justin Theroux

The Your Highness actor (in Cabo San Lucas, Mexico, in December 2012) "runs a lot," a Theroux source tells Us Weekly. "He's a kind of 'train yourself' type."

Related: Hottest Celeb Eye Candy

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Jon Hamm

"I'm a very good athlete," the Mad Men actor (in Maui, Hawaii, in October 2012) tells Playboy of his preferred method of staying in shape. "I'm coordinated and can do a lot of things."

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James Marsden

"The gym mentality doesn't work for me," the 30 Rock guest star (in Maui, Hawaii, in June 2012) tells Men's Health. "It's too isolating. I have to be outdoors chasing a ball. And I feel substantially better about myself when I do."

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Chris Evans

To prep for his role in Captain America: The First Avenger, Evans (in Santa Clarita, Calif. in February 2012) tells Us Weekly he "worked out for about four months for about two hours a day. It was pretty brutal."

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Daniel Craig

The Skyfall actor (in the Bahamas in February 2006) works with trainer Simon Waterson to maintain his hot bod. "His workouts are a blend of power lifting, with a lot of compound exercises thrown in," Waterson tells GQ UK.

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Mario Lopez

As the author of cookbooks Extra Lean and Extra Lean Family, the TV host seems to know something about healthy eating. As for fitness? Lopez (seen swimming after a jog on the beach in Miami in March 2012), stresses the importance of being "open to trying different kinds of workouts."

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Jake Gyllenhaal

"I haven't cycled in a long time," the SoulCycle devotee (in Oahu, Hawaii, in July 2011). "I don't run anymore. But do I take care of my body and take conditioning seriously? Yes."

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Ryan Phillippe

We Know What He Did Last Summer! The Cruel Intentions actor took his ripped physique to the beaches of Miami in June 2014. Phillippe's trainer Happy Hill told Men's Health that the actor is not only consistent with his workout routine, but also likes variety — "so he isn't bored."

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Chad Michael Murray

The One Tree Hill alum (in Las Vegas in August 2009) tells Seventeen he runs one mile "two to three times a week."

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Joe Manganiello

"My trainer, Ron Matthews, is the best in the business. So I pay him money to kick my ass!" the actor (in Miami Beach in June 2012) tells Us Weekly. "It's a brutal 60 minutes three times a week, and then the other nine workouts are on my own."

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Ryan Lochte

"If you take two or three days off, you are not going to feel right for a week or two," the Olympic swimmer (in London in July 2012) tells Vogue of his training schedule.

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Mark Wahlberg

The actor showed off his toned physique on the set of Pain and Gain in Miami in March 2012. Between films, his workout consists of a "jump rope warm-up, hitting the bags, mitt work, and maybe some sparring with buddies before 30 to 40 minutes of weights," he tells Men's Health.

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Ryan Seacrest

The TV host (in St. Barts in January 2013) stays trim by regularly drinking Brazilian Thunder smoothies, a concoction of kale, coconut water, collard greens, cinnamon, ginger and lemon. "I literally drink this first thing in the morning and I drink it before I go on American Idol," Seacrest says. "It's really good for you and it keeps your energy up."

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Chace Crawford

The Peace, Love & Misunderstanding star revealed his flawless physique in Cabo San Lucas, Mexico in February 2012. "I try to do something physical or active, whether it's running or going to the gym," Crawford tells Us Weekly of his fitness routine. "I go about three or four days.

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Colton Haynes

With a promise of "less clothing" in his second season of the MTV series Teen Wolf, the heartthrob gave fans a sneak preview by flaunting his chiseled abs in Malibu in April 2012. The show's producer uploaded a picture of Haynes on his Tumblr and commented that the actor/model went through "three months of serious training" to bulk up.

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Chris Hemsworth

The Avengers star flaunted his tight abs and chiseled chest in St. Barts, France. To prep for his role as a superhero, Hemsworth had to pack on 20 lbs of muscle. "It wasn't until Thor that I started lifting weights," the hammer-swinging celeb told Men's Health. "It was all pretty new to me."

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Joe Jonas

The singer sure is "Burnin' Up!" The teen pop sensation strolled the beaches of Bondi Beach in Sydney, Australia in April 2012. To keep in shape, Jonas tell GQ his workout entails "two hours of just sweating."

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Trevor Donovan

A shirtless Donovan went for run and gave onlookers some eye candy in Hollywood in July 2011. The 90210 stud tells Men's Health he hits the gym daily and ditches the city on weekends to work out on the beach. "There's nothing better than keeping fit," says Donovan. "It gives me energy and helps me think more clearly."

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Patrick Schwarzenegger

The model enjoyed a dip in Miami on March 25, 2012. In addition to jogging, Schwarzenegger does push-ups and pull-ups to maintain muscles mass and burn fat.

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Eddie Cibrian

The Playboy Club stud showed off his buff body in Cabo San Lucas, Mexico in April 2012. The actor, who had just renewed his vows with LeAnn Rimes, tells Us Weekly they make fitness a priority: "We go to the gym together."

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Harry Styles

The One Direction singer revealed his toned body in Sydney, Australia in April 2012. "We love the Trixter Xdream bikes," Styles has said. "You don’t realize how hard you are working as you are so engrossed in beating each other to the finish line but it's a great workout!"

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Jared Padalecki

Padalecki is no longer the skinny kid he once was on Gilmore Girls. According to Men's Health, the Supernatural star's regimen includes short, intense workouts with two-time world bench-press champion, Scot Mendelson. He also snacks on 600-calorie protein shakes.

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Dermot Mulroney

The New Girl guest star caught some waves in sunny Santa Monica, Calif. in May 2011.

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Gerard Butler

Butler famously beefed up for his role in 2007's 300, but in August 2011, he debuted a slimmer—but still muscular!—frame in Santa Monica, Calif. in August 2011. Of his slimdown, the actor tells Us Weekly: "I'm just doing a lot of cardio and watching what I eat. I stopped lifting big weights and I'm doing yoga."

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Ryan Kwanten

The True Blood hunk's chiseled torso made a splash by the ocean in Malibu, Calif., in August 2014. "I just work out for my own sanity, to be honest," he told Vulture in 2011. "I grew up in a competitive, sporting environment. It's just sort of part and parcel of who I am."

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Colin Egglesfield

The Client List actor went for a shirtless run in L.A.'s Brentwood neighborhood in June 2011. To get abs like Egglesfield's, he suggests running for 30 to 45 minutes. "It's the perfect complement to weight training if you're serious about dropping those extra winter pounds," he tells The Examiner.

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Robert Pattinson

"He has been trying to get more outdoorsy and cut down on smoking and drinking," a source tells Us Weekly of the Twilight actor (in Malibu in March 2012), adding that he's been "doing more athletic stuff."

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Ben Affleck

"I'm not in shape," the actor (in Puerto Rico in July 2012) said while promoting The Town in 2010. "I hate to exercise."

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Austin Butler

The Carrie Diaries actor paddleboarded while vacationing in Hawaii in January 2012. His advice for keeping workouts fun? "Do some yoga then listen to James Brown," he once tweeted. "You won't regret it!"

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Jude Law

The Repo Men actor (in Maui, Hawaii, in January 2013) stays buff thanks to trainer Lisa Twight. "We work with kettlebells, do deadlifts, pull-ups and drag chains," she tells Men's Fitness.

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Joshua Jackson

The Fringe star showed off his buff body while vacationing in Los Cabos, Mexico, in November 2012.

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Zachary Levi

The Chuck star was spotted sans shirt on the beach in Maui, Hawaii in January 2012.

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Kellan Lutz

"A lot of it is genetics," the Twilight actor (in St. Maarten in April 2010) tells Us Weekly of his buff body. "But I also do a workout for 45 minutes with the heaviest weights that I can."

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Keith Urban

"When you are touring, the physical energy it takes to put on shows tends to keep you fit," the singer (in Saint-Jean-Capt-Ferrat, France in October 2012) tells Men's Health. Urban also powers through four-days-a-week cardio workouts on an elliptical machine and light weight training. "What I need to start doing on top of that is yoga. It's hard, but it's definitely in my future."

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Lance Armstrong

"Back in the day, people trained on just their feelings," the retired cyclist (in Miami Beach in August 2006) tells Men's Health. "Now you have heart rate, altitude, lactic acid all measured on one unit."

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Josh Bowman

"My workout regimen at the moment is nonexistent," the Revenge actor (in Monaco in June 2012) jokingly tells GQ. "I wake up in the morning and brush my teeth. My toothbrush and deodorant are my only dumbbells."

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Gilles Marini

"I go to the gym sometimes and I do some other sports like soccer or mixed martial arts," the Brothers & Sisters actor (in Monaco in June 2012) tells DA MAN. "I don't have to go out of my way to try to sweat and work hard because I don't eat a lot of carbs."

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Cristiano Ronaldo

The Portuguese soccer player (in Sardinia, Italy, in May 2009) says he trains for nearly four hours per day and follows a strict diet plan.

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Alexander Ludwig

The 6-foot-2 actor (in Maui, Hawaii, in January 2013) beefed up for his role in The Hunger Games. "I am always working out, whether I am on vacation or at home," he tells Vanity Fair. "I like to surf, play tennis, and golf—but surfing is definitely my favorite."

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Mark Ballas

The Dancing With the Stars pro (in Las Vegas in June 2011) released his own BootyFirm workout system with Pro Form. "It combines fat-burning cardio with targeted body-sculpting resistant moves for amped-up results," Ballas says.

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David Beckham

For H&M's 2013 fall campaign, the retired soccer star strips down to his underwear. "I heard this the other day. Someone said that I had a stand-in for my bum, but no, I can confirm that's my bum," Beckham told French TV show Le Grand Journal of the ad.

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Matt Lanter

"I don't have a strict thing that I do every time. I just get a little cardio in, do a little weights," the 90210 actor (in L.A. in September 2010) tells Us Weekly. "Lately, I've been jumping rope. That works so well."

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Colin Firth

The Academy Award winner (in Greece in September 2007) works with trainer Cornel Chin. Under his guidance, Firth does home workouts incorporating strength exercises that use his own body weight.

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Ian Ziering

The Beverly Hills, 90210 actor (in Malibu in July 2007) participates in triathlons and competed on Dancing With the Stars.

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Diego Boneta

To stay in shape, the Rock of Ages actor (in Miami in June 2011) does sit-ups, jumps rope, and runs stairs.

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Wilmer Valderrama

"Running is my way of gathering my thoughts and truly investing and finally doing something for me," the actor (in Miami in September 2012) tells Details. "I do my best to run every other day and mix in mixed martial arts in between those days. Outdoors. I tour the concrete jungles and occasionally go on hikes."

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Jon Bon Jovi

"I was doing Workout 101 for years: treadmill, elliptical, weights. Now I'm going to do yoga," the rocker (in St. Barts in January 2012) tells Men's Health. "I went for my first time, and I enjoyed it. I'm a 21st-century man."

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Sean Penn

The Gangster Squad actor (in Maui, Hawaii, in January 2013) jogs regularly near his Malibu home.

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The Situation

In addition to daily workouts, the Jersey Shore star (in Seaside Heights, New Jersey, in June 2012) eschews simple carbs and gets plenty of rest. "Sleep is when your body grows and repairs itself," he tells Men's Fitness.

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Lil Romeo

"I run in the morning, lift weights in the afternoon, do basketball training at night, and then lift weights again at night," the rapper (in L.A. in March 2009) tells Seventeen.