Comment by Trinch: The lighting is a bit harsh and the background is cluttered, taking away contrast from the subjects. Perhaps by taking the photograph while the were passing through the shade of a trees or a bridge could have improved the lighting. As far as the clutter, narrowing the field to just one or two lone runners would make it easier to ensure a clear definition between the subjects and the background.
Comment by ErikV: Great patterns and leading lines. Cropping the top and perhaps a little bit from the bottom would strengthen the patterns and lines even more.
Comment by tpbremer: Came back to bump this up. Real nice. I like the black and white, and the simple composition. Less is definitely more in this shot. 9