Friendship and fitness! How do celebrities like Reese Witherspoon, Cameron Diaz, and Nicole Richie stay in shape? By assuming downward dogs, hitting the pavement, and shedding those pounds -- together! Click through to see more stars and their workout buddies.
Nicole Richie and Cameron Diaz
The great outdoors! Richie and Diaz took their dogs out for a brisk hike up Runyon Canyon Park in Hollywood.