Runners compete in the 2014 Beijing Mountain Marathon on September 14 at Beijing Xishan National Forest Park in Beijing. The 42.195-kilometer mountain marathon course features winding paths, gravel road and trails and steps that bring out thousands of marathon enthusiasts. Photos: Cui Meng/GT

A runner drinks water. No paper cups were offered to the racers during the event in order to promote environmental awareness.

A runner poses while competing in the event.

A runner competes in the event while carrying a child.