Elisabeth Hasselbeck
The View host runs like the wind in the More-Fitness Women's Half Marathon in NYC's Central Park.
Cory Monteith
The Glee star stays fit in the winter by snowboarding, natch. He took part in a celebrity ski challenge to benefit Operation Smile.
Reese Witherspoon
Baby on board! With kid No. 3 on the way, the Oscar winner maintains her healthy lifestyle by heading out for a walk in L.A.
Prince Harry
Britain's most eligible bachelor shows off his sprinting skills while visiting Olympic runner Usain Bolt in Jamaica. Who won? The prince, obvs—he's too charming to lose!
Heidi Klum
The supermodel supermom takes a break from her hectic schedule for a mother-daughter paddleboard outing with Leni in Malibu.
Miley Cyrus
Puppy love! The pop star spends quality time with her pooch and squeezes in a workout at the same time.
Natalie Portman
The Black Swan star takes her tiny tot, Aleph, for a hike in L.A. Awww.
Olivia Wilde
The gorgeous gal hikes in L.A.'s Griffith Park with her best pal, Paco.
Denise Richards
Who needs weights (or a man) to help with the heavy lifting when you've got guns like these? The toned mama of three gets a workout just by lifting this huge box of Arm & Hammer cat litter!
Michael Bublé
The Canadian-born singer gets in a workout with his hometown Vancouver Canucks.
Ryan Sutter
The original Bachelorette winner has been training (and training and training) for all kinds of endurance events, and plans to run the New York City Marathon (again!) this weekend.
Impressed? Check out his intense web series about endurance training to see how he does it.
Tamra Barney
This Real Housewives of Orange County star enjoyed getting dirty at the Del Mar Mud Run. Does it say cougar on her shirt?! Get it, girl!
Ed Helms
While many stars were prepping for the Emmys, the Hangover actor got down and dirty in Zuma Beach, Calif., for the Nautica Malibu Triathlon to benefit the Children's Hospital Los Angeles' pediatric cancer research.
Charlie Sheen
Winning! The Major League star proves he's still got some baseball skills as he visits Phoenix's Chase Field, where he took batting practice before the Arizona Diamondbacks faced off against the New York Mets.
Shakira
The "Hips Don't Lie" singer puts those, well, hips, to good use as she shows off her golfing skills in Mexico.
Kellan Lutz
Now we know how this hot Twilight star stays in sexy vampire shape.
David Beckham, Brookly, Romeo & Cruz
A workout never looked so fun, as the Beckham boys and a friend hit the Malibu surf.
Justin Theroux
Jennifer Aniston's main man squeezes in a jog during their Hawaiian vacation. Priorities, priorities!
Pippa Middleton
One of the world's most famous siblings (not to mention one of the hottest!) takes part in the GE Blenheim Triathlon in Woodstock, England.
Kristin Chenoweth
Tickets for the U.S. Open are now on sale, and this Tony winner is ready to deliver the news with tennis legend John McEnroe (not pictured).
Julianne Hough
The Rock of Ages star puts the beaches of Miami to good use.
Kellan Lutz
The Twilight hottie practices his basketball moves at the Muscle Milk Fitness Retreat in Los Angeles. Lutz was joined by fellow muscle men Doug Reinhardt and Ryan Rottman.
Justin Timberlake
Talk about sweat equity! Avid golfer J.T. kicks off a Callaway Golf contest in Brooklyn, N.Y.
Josh Duhamel & Fergie
The adorable couple spends some alone time while hiking in L.A.