Trail running is fun but it can also be quite challenging as it typically involves running on Nature trails such as in MacRitchie Reservoir, Bukit Timah or Tampines Mountain Bike Park instead of normal roads or pavement. These trails are usually unpaved and the terrain is very uneven with holes, puddles tree roots or rocks covering the path. Those who are new to trail running will likely learn quickly that twisted ankles and knees are very common while trail running if a proper footwear is not use.