The Fat Mak Trail Race (FMTR) is a trail running race in named after a prominent rock known as "Fat Mak Rock", located along the route. This rock is situated in the middle section of Tai Shing Stream (KK05288090) and features the Chinese characters 肥佬麥 (meaning "Fat Mak Rock") painted on it. Some netizens pointed out that the painted name "Fat Mak Rock" has appeared as early as 1975. If this is true, it means that "Fat Mak Rock" has a history of nearly 50 years! The origins of the name "Fat Mak Rock" and any associated stories remain unclear. The intriguing name not only makes the rock a popular spot for check-in, but also provides a 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).