A trip to the doctor finally convinces 27-year-old New York party girl Brittany to make a change. Too broke for a gym, Brit laces up her sneakers and runs one sweaty block. The next day, two. After finishing her first mile, she sets an almost unthinkable goal: running in the New York City Marathon. Written and directed by Paul Downs Colaizzo, Brittany Runs a Marathon stars Jillian Bell, Michaela Watkins, Micah Stock, Utkarsh Ambudkar, Alice Lee and Lil Rel Howery.