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.
Minka Kelly and Mandy Moore
Minka and Mandy duke it out! The best friends punched it out in the ring back in March. "We pack a mean punch," the "Crush" singer wrote via Instagram. "Well actually @minkak does and I'm just trying to copy her bad-ass-ness."