Film Sundance Film FestivalSundance 2019: ‘Brittany Runs a Marathon’ is Charming but OverhypedBrian MarksFebruary 10, 2019February 10, 2019 by Brian MarksFebruary 10, 2019February 10, 2019Jillian Bell shines in 'Brittany Runs a Marathon,' a charming but slight film exploring self-love and body positivity.