No Excuses
The 55-year-old queen of pop hit up Cycle House in Los Angeles for a good sweat session in a pair of slouchy black track pants, a "No Excuses" beanie, sunglasses and her favorite accessory: a grill.
Pretty in Purple
Hilary Duff leaves a West Hollywood gym after working up a sweat in a purple shirt and black tights.
Model Abs
Actress and model Rosie Huntington-Whiteley flaunts her chiseled abs in a sheer black sports bra and leggings as she leaves the gym in West Hollywood.
Hiking Gleek
The "Louder" singer and Glee star, Lea Michele, rocked a black sports bra, Nike leggings and fanny pack while hiking with a friend in Los Angeles.
Dance Star
Karina Smirnoff sizzled in JCPenney's Xersion and CityStreets activewear lines as she led dance classes and juiced healthy treats with JCPenney's Bella High Power Juice Extractor and Magic Bullet Blender with Hilaria Baldwin.
Post Pilates
Olivia Wilde—who announced her first pregnancy with beau Jason Sudeikis last month—leaves a Pilates workout in West Hollywood, Calif.
Keeping Cool
Taylor Swift keeps hydrated after a gym visit in West Hollywood, Calif.
Yoga Pose
Real Housewives star Brandi Glanville gets in an early morning yoga session at a park in Beverly Hills.
Jogging Buddies
Amanda Seyfried—in a sky-blue sweatshirt, dark leggings and matching sneakers—steps out for a light jog with pup Finn in New York City.
Model Fitness
Christy Turlington preps for the 2013 New York City Marathon with an early morning run, sporting navy leggings, a striped crew-neck top and sneakers with neon detailing.
Sleek Physique
Rosie Huntington-Whiteley—looking workout-chic in a tank, leggings and multihued sneakers—totes a black python-printed Smythson clutch while out and about in Los Angeles.
Rockin' Workout
Kelly Osbourne—in a loose camouflage tee and sweats—strikes a pose with her trainer Lacey Stone after a full body cardio circuit at mom Sharon Osbourne's home in Beverly Hills.
Muscle Maven
Kaley Cuoco steps out for a West Hollywood gym run in a black sweatband, cross-printed muscle tee, gray sports bra and cropped cobalt leggings.
Workout Chic
Reese Witherspoon heads to the gym in Brentwood, Calif., wearing an Alternative Apparel slouchy pullover, Nike track shorts and matching sneakers.
Shady Lady
Emily Blunt wears a layered gym-ready look (in leggings, a striped tee and cool cat-eye sunglasses) while out and about in West Hollywood.
Walking Babe
Stacy Keibler breaks a sweat and looks cute like she's at it—wearing cropped spandex, layered tanks and pink-trimmed sneakers—on the Cybex Arc Trainer in Los Angeles.
Team Tie-Dye
Anne Hathaway pairs a black headband and sneakers with surprisingly chic tie-dyed leggings while heading to a workout in New York City.
Power Walk Pink
Reese Witherspoon keeps it comfy and cool in a fuchsia top, black leggings and pink-trimmed sneakers for a workout in Brentwood, Calif.
Green Machine
Hot mama Brooke Burke-Charvet looks workout ready while shooting an ad for her Baboosh Body company in Mexico.
A Leg Up
Au naturale Whitney Port wears a blue Atmosphere jacket, black striped tee and cute shorts by ROXY Outdoor Fitness as she prepares to run in Los Angeles.
Animal Lover
Mom-to-be Jenna Dewan-Tatum dresses up her growing baby bump in a red Lole Studio cardigan and black comfy sweats while she walks her dogs in North London.
Blue Streak
Donning a bright blue top and black leggings, Camila Alves fit in a quick gym session while visiting New York City with husband Matthew McConaughey.
Keeping Up with Fitness
For a morning workout in Los Angeles, mom-to-be Kim Kardashian pairs her gray-and-white zip up with black leggings and Nike shoes.
Positively Glowing
While out and about in Los Angeles, Heidi Klum wears a neon yellow 360 jacket and cropped black capris from her New Balance collection. Bright blue sneakers add a playful touch to her sporty ensemble.