Exciting infographics from a few years back about the popularity of mud runs.

Mud runs are more accessible, social, and less committal. You can skip obstacles, get dirty and have fun.

Marathon running takes a different kind of mental focus.

Mud Runs are exploding among younger runners — the average age of mud runners is 26.

The average age of a Boston Marathon finisher is 39.

Source: http://www.bloodsweatandcheers.com/