You can run either way on the Spring Brook Loop - both ways you'll encounter great views over the plains to the Flatirons, then some nice through the woods. We prefer to run clockwise, which may provide better views halfway around the loop.
Climb up a rocky singletrack that's not too steep. The trail works its way into the trees and the becomes more deeply wooded as you continue on. At the halfway point, you'll arrive at a marked intersection. Stay straight to complete the loop (Spring Brook Loop North).