According to running USA, " mud runs " like tough mudder, Spartan beast, and warrior dash have grown the fastest and now attract some 1 million participants each year. 据RunningUSA数据显示,ToughMudder、SpartanBeast和WarriorDash等“泥浆赛跑”已经达到最快的增长速度,现在每年可吸引约100万名参与者。