Fat Mak Trail Race (FMTR in short) is a trail running race in which the name is inspired by a big rock called "Fat Mak Rock" in the route. "Fat Mak Rock" sits in the middle section of Tai Shing Stream (KK05288090) with Chinese characters 肥佬麥 (meaning Fat Mak Rock) painted on it. Some netizens pointed out that the paint "Fat Mak Rock" has been appeared as early as 1975. If it is true, it means that "Fat Mak Rock" has a history for nearly 50 years! There is no idea why "Fat Mak Rock" was written or there is any story behind. The interesting name of "Fat Mak Rock" not only makes the rock famous for check-in, but also provides design element for the race.

The race requires runners to run within the trails inside Tai Mo Shan and Shing Mun Country Park with some moderate climbing. The race has two distances, 14km and 35km, the start and finish are both at Grass Dam (Shing Mun Country Park).