Great photo, which unfortunately is only harmed by being split into three panels. The vertical black bars clash with the slanted black tree trunks. Bet you could make a superb photo (albeit not for this challenge) by editing out the trees.
I love the colours in this composition and the silhouetting of the runners is very effective. If I was going to suggest any weaknesses I guess they would be to do with the symettry of the picture, It would have been nice to have lamposts and trees in either all three frames or just the central one (which from the fact that the mountain in the background runs evenly is I guess something you had no control over) Equally, I may have tried to go for just two runners in each frame. Love the application of rule of thirds in terms of dark area at the bottom of the frame