In American off-road racing, you’d be hard-pressed to find a more challenging race than the Tennessee Knockout Extreme Enduro. Set in the hills of Tennessee, the course is littered with sections of slick rock, has its fair share of creek sections and a section full of man-made obstacles pulled straight from an endurocross track. On top of the demanding course, the August date makes the weather a factor as heat and humidity inch the heat index up toward 110 degrees fahrenheit. Each year some of the world’s best enduro riders turn up to the Trials Training Center to chase the TKO championship.