I had the impression that this weekly photo challenge fits quite well to my last app Bluristic.
I captured a friend on his bike two month ago. The sun was going down on a quite warm day and the bright blue background was perfect for tracking the movement of the bike in motion with this app.
You can see the full resolution when you click on the image.
For more information on the app Bluristic just click here on the icon :
You can find more information about the contest : Here
Have a nice day