Overend Mountain Park, named after Durango, Colorado, living legend Ned Overend, who owned some of the amazing hilly landscape before turning it over to the city to be procured as a mountain biker's heaven, was formerly known as the Test Tracks. And there, you can test many things: your lung capacity, your zest for speed, your ability to ride arroyos up and down, and the strength of your quads. This place is awesome.
There are numerous access points on the West side of Durango, but the trail heads at Leyden Street and Ella Vita are perhaps the most commonly used.
This endless network of crushed shale singletrack is some of Durango's oldest and best. There are sweet bridges that cross washes linking countless options for loops- each with their own personality and all with fast turns, coupled with some seriously steep climbs. Climbing Ned's Hill will suck the life right out of you and bombing Star Wars like you're in an X-wing fighter will put it right back in. Englehart's Trail to Hidden Valley quickly take you out of suburbia to a remote forest hiding above town. The Spirit Trail quietly edges a cemetery, and 8 Bells is fun climb that links groups of trails. The Falcon trail is a downhill trail, meant to be ridden that way, and if you ride the Hogsback, which you should, you'll find yourself in medias res of the sweeping physiography that stands over the entire city of Durango. An invigorating hike-a-bike up to and ride off the summit is another story in itself.
May the force be with you.