We spotted Leslie Mann and Jason Segel working out during a scene for the film "This is Forty" in Los Angeles. Jason's character is playing a personal trainer.

The film is helmed by Mann's husband Judd Apatow, who made "Knocked Up" and "The 40-Year-Old Virgin." Paul Rudd and Mann are reprising their "Knocked Up" characters Pete and Debbie.

"This Is Forty" also stars Megan Fox, Albert Brooks and John Lithgow.