"Running meditation." It's almost a cliché. Many people describe their running activity as a form of meditation. There are even articles that will teach you "how to meditate while running."
The Tendai-shu monks of Mount Hiei in Kyoto do a walking meditation, called jogyozanmai in Japanese. So if you are someone who views running as a natural progression from walking, it surely follows that if there is walking meditation, there must be running meditation too.
People run for many reasons but one of them is to help clear the mind. This is usually a case of leaving behind work, family and the stresses of life to go out and move with the wind, worry-free. For this reason, running is a great way to relieve stress. For many of us, running also helps keep us mentally balanced, by giving us time to be mindful of body movement, breath, posture, etc. It helps us focus.