"Brittany Runs a Marathon" is a hilarious and outgoing film about New Yorker Brittany Forgler, who is everybody's best friend except maybe her own. At 27, her hard-partying ways, chronic underemployment, and toxic relationships are catching up with her.
When Brittany tries to score some Adderall from a new doctor's office, she unexpectedly gets a prescription she never wanted: Get healthy. Too broke for a gym and too proud to ask for help, Brittany is at a loss.
However, her seemingly together neighbor Catherine pushes her to lace up her Converse sneakers and run one sweaty block. The next day, she runs two. And soon, after finishing her first mile, she sets an almost unthinkable goal: running in the New York City Marathon.