Jillian Bell Ran Off 40 Pounds for 'Brittany Runs a Marathon'!

Jillian Bell made an appearance on The Late Show with Stephen Colbert on Wednesday (August 14), and revealed that she committed to running off 40 pounds of weight while shooting her film, Brittany Runs a Marathon.

“Very dramatic, but it’s a comedy as well. I did a lot of running. I was running a lot and I actually started training on my own,” the 35-year-old actress told Stephen. “I decided I wanted to do the physical journey of the character. I committed on my own to loosing 40 pounds because that’s what the character goes through in the film.”

“I decided to do it like maybe Daniel Day Lewis would do it, I looked it up on Pinterest and I found out that you can do a thing called from couch to 5k,” Jillian continued. “The first step is get up and move a little bit.”

Award-winning playwright Paul Downs Colaizzo makes his directorial debut with Brittany Runs a Marathon, an uproarious, irreverent and surprisingly emotional comedy inspired by real events.

Amazon Studios is set to release Brittany Runs a Marathon in theaters on August 23 – Check out the brand new poster in the gallery!