One hell of an enduro ride!
If you're looking for a challenging enduro trail the "Kelle" is the right route for you! Starting at the top of Gornergrat you'll reach the trail following a maintenance road down to the Gornergratsee. From there the fun starts with a high alpine and technical singletrail all the way down to Grünsee. If you haven't had enough, continue your tour on "Rock'n'Roll", a technical enduro trail through the forest, which will take you back to Zermatt.