Kristin Cavallari
The reality starlet keeps in shape before her wedding by jogging in Beverly Hills.
Justin Bieber
The pop star gets his workout on playing soccer while in Barcelona
Reese Witherspoon
For this A-lister, a fun way to stay in shape is going for a run in her Brentwood neighborhood.
Russell Brand
The funnyman is serious about his workouts and goes for a jog in Tribeca.
Jake Gyllenhaal
With a jacket like that, the Love and Other Drugs star can't be missed while he jogs with his dog, who is way behind him!
Matthew McConaughey
The Hollywood hunk gets ready to go on his daily run.
Owen Wilson, Scarlett Johansson & Sean Penn
The trio tiptoes through the tulips hauls ass in Los Angeles.
MORE: Scarlett Johansson "Not Pregnant" but "In the Shape of Her Life"
Paris & Nicky Hilton
The sisters manage to successfully keep up with each as they strut their stuff on behalf of Josh Duhamel's Youth Run 4 Japan event in Santa Monica.
Chris Brown
In yet another stab at getting some not-totally-negative attention, the newly-blonde Brown hoops it up at New Era Cap's E League charity basketball game. Well, good for him.
Rob Kardashian
His sisters may get all the attention from the cameras, but Rob Kardashian commands the court during the charity game in Santa Monica.
Orlando Bloom
The hunky actor prefers the two-wheeled kind of workout. But hey, Orlando, where's the helmet?!
Kevin Bacon
Who goes for a jog all bundled up in Miami? The star came prepared for some unusually frosty temps in the Sunshine State.
Jerry O'Connell
Rebecca Romijn's other half doesn't let the rain put a damper on his—or his dog's—fitness regimen!
Kim Kardashian
How do you keep the most famous backside in America toned? The reality reveals her secret.
Reese Witherspoon
While it's no surprise to see the trim actress keeping fit, who knew she was an Oregon fan?
Jennifer Love Hewitt & Alex Beh
The possible Emmy nominee and her new man show off their medals for finishing the Dodge Rock 'n' Roll Half Marathon. Way to go!
Khloé Kardashian Odom, Lamar Odom & Rob Kardashian
The family that works out together…um, yeah, that's all we got.
Channing Tatum
Somebody clearly takes his exercising very seriously.
Renée Zellweger
Even while vacaying in Paris, the Oscar winner knows the importance of keeping up with one's running routine.
Amanda Seyfried
Realizing that reading all those letters to Juliet isn't much of a workout, the actress decides to step it up a notch.
Ke$ha
Hey, if you want to keep a dollar sign in your name, you gotta stay in shape, right?
Shia LaBeouf
We've got an eagle eye on the actor as he looks to transform himself with a workout.
Jerry O'Connell
While the rest of the family's enjoying some milk, dad and the dog get in some exercise.
Matthew McConaughey
Hollywood's hardest-working hottie could use a refreshing cold shower after his stimulating workout.