Brittany Forgler is a 28-year-old living in New York City, employed as a greeter at an off-Broadway theater. She and her roommate Gretchen, a teacher's assistant dreaming of social media fame, are hard partiers who abuse drugs. Visiting a new doctor to score an Adderall prescription, Brittany receives the unwelcome diagnosis that she is overweight and must get healthier. She visits a gym only to find even the cheapest membership fee is out of her reach. Despite her fear, she sets small achievable goals, and tries running on her own outdoors. She is invited to run in a group with her neighbor Catherine, whom Brittany detests for her seemingly perfect life. After another night of partying by Gretchen, Brittany joins the group run and meets Seth, another struggling runner, learning they have equal goals. Brittany, Seth, and Catherine bond and, after a 5K run, set the ultimate goal: running in the New York City Marathon. Brittany seeks a second job to afford a gym membership, and becomes a pet sitter in a wealthy home. On her first day, she meets fellow pet sitter Jern, who is essentially living in the house against the rules. After a falling out with Gretchen over her changing lifestyle, Brittany moves into the house as well, bonding with Jern over their stalled lives. Seth and Catherine's predictions that Brittany will have sex and fall in love with Jern eventually come true.
Jillian Bell as Brittany Forgler
Michaela Watkins as Catherine
Utkarsh Ambudkar as Jern Dahn
Lil Rel Howery as Demetrius
Kedar Williams-Stirling as Marc
Brittany Runs a Marathon is a 2019 American comedy film written and directed by Paul Downs Colaizzo, in his directorial debut. It stars Jillian Bell, Michaela Watkins, Utkarsh Ambudkar, Lil Rel Howery, and Micah Stock. The film follows an overweight woman in New York City who sets out to lose weight and train for the city's annual marathon.
It had its world premiere at the Sundance Film Festival on January 28, 2019 and was released on August 23, 2019, by Amazon Studios.