The 20th annual running of the G.A.C. Fat Ass 50K took place on Saturday, Jan. 5, 2019, at Bradley Palmer State Park in Topsfield, Mass. The following are a small sample of the photos taken during the 6-hour trail race. A full photo gallery with 186 photos can be found on the MassUltra Facebook page here.

All photos on this page and in the gallery are by Chris Wristen, editor of MassUltra.com.