celebs wearing the fitness trend

by SheKnows
Sep 12, 2011 at 2:20 p.m. ET
Jessica Biel sports her fitness gear at the Revlon Walk.

1 /19: Cameron Diaz

1/19 :Cameron Diaz

Looking dazzling, even after hanging at the gym.

2 /19: Katy Perry

2/19 :Katy Perry

Katy chooses funky running shorts and plain top when running around town.

3 /19: Ashley Greene

3/19 :Ashley Greene

The Twilight star displays a pop of color under her black workout gear.

4 /19: J Alba

4/19 :J Alba

Jessica Alba looks laid back and sporty in her basic workout attire.

5 /19: Fit Kardashians

5/19 :Fit Kardashians

The Kardashian sisters manage to look fabulous after hitting the gym.

6 /19: Feelin' bright

6/19 :Feelin' bright

Ellen Pompeo livens up her gym clothes with a bright zip hoodie.

7 /19: Sporty fab

7/19 :Sporty fab

Nicole Richie trades her boho threads for simple gym attire.

8 /19: Kim K

8/19 :Kim K

Kim Kardashian gives up her favored animal print for simple gym basics.

9 /19: Looking fierce

9/19 :Looking fierce

Ashley Tisdale doesn't sacrifice fashion when heading to the gym.

10 /19: Shenae Grimes

10/19 :Shenae Grimes

The young actress opts for a casual shirt and running shorts.

11 /19: Kristin Cavallari

11/19 :Kristin Cavallari

The California blonde sports a colorful shirt during Dancing with the Stars rehearsals.

12 /19: Elisabetta Canalis

12/19 :Elisabetta Canalis

This Italian babe works out in a sports bra and track pants.

13 /19: Matchy-matchy!

13/19 :Matchy-matchy!

Karina Smirnoff perfectly matches her workout wear.

14 /19: Running girl

14/19 :Running girl

Reese Witherspoon opts for a touch of color in her running pants.

15 /19: All about layers

15/19 :All about layers

Ashley Greene layers a casual tee over an aqua tank.

16 /19: Fitness fashionista

16/19 :Fitness fashionista

Charlize Theron looks fashionable even when heading to the gym.

17 /19: Ashley Greene

17/19 :Ashley Greene

Ashley Greene keeps her gym outfit simple with a grey tee and black workout pants.

18 /19: Reese Witherspoon

18/19 :Reese Witherspoon

Reese opts for bright colors when unwinding at Yoga.

19 /19: Khloe Kardashian

19/19 :Khloe Kardashian

The always glam star keeps it simple at the gym with an aqua hoodie and leggings.