De 27-jarige Brittany woont in New York en komt dagelijks te laat aan op haar werk na een nachtje stappen. Wanneer ze voor een kleinigheid een dokter bezoekt krijgt ze in plaats daarvan een waslijst aan diagnoses te horen. Opeens wordt ze gedwongen over haar levensstijl na te denken, waarna ze besluit te beginnen met hardlopen.
Nee, helaas is Brittany Runs a Marathon nog niet beschikbaar op Netflix in Nederland.
| Production | Tobey Maguire | Producer |
| Writing | Paul Downs Colaizzo | Writer |
| Production | Matthew Plouffe | Producer |
| Production | Margot Hand | Producer |
| Directing | Paul Downs Colaizzo | Director |
| Production | Jillian Bell | Executive Producer |
| Art | Kim Fischer | Set Decoration |
| Editing | Casey Brooks | Editor |
| Costume & Make-Up | Stacey Berman | Costume Designer |
| Art | Naomi Munro | Art Direction |
| Camera | Seamus Tierney | Director of Photography |
| Production | Paul Downs Colaizzo | Executive Producer |
| Art | Erin Magill | Production Design |
| Sound | Duncan Thum | Original Music Composer |
| Production | Padraic 'Paddy' Murphy | Associate Producer |
| Production | Jolian Blevins | Co-Producer |
| Production | Maribeth Fox | Casting |
| Costume & Make-Up | Dennis Polanco | Hair Department Head |
| Costume & Make-Up | Scott Hersh | Makeup Department Head |
| Production | Richard G. Weinberg | Executive Producer |
| Visual Effects | Alex Noble | Visual Effects Supervisor |
| Art | Lindsay Stephen | Set Decoration Buyer |
| Sound | Ric Schnupp | Sound Re-Recording Mixer |
| Sound | Ric Schnupp | Supervising Sound Editor |
| Production | Laura Rosenthal | Casting |
| Directing | Thomas Fatone | First Assistant Director |
| Directing | Kim Thompson | Second Assistant Director |
| Production | Jolian Blevins | Unit Production Manager |
