You could use a shoe with wings. A tattoo of a running shoe with wings attached to the back will make the shoe appear as if it is flying. As a runner, you know this symbol is synonymous with track and cross country athletes. The picture is a popular choice by runners for a tattoo, and it works anywhere on the body. You can also customize this tattoo to your liking by making it your favorite pair of running shoes or just your favorite color.
The silhouette of a runner can also be an interesting tattoo, because it can be customized in any way. The runner can be all black, a light gray or even just an outline. Your tattoo could feature a runner, wearing a bright pair of your favorite running shoes or even put him in a running jersey and shorts. You can have him running in mid air or you can place him on a road, on a trail or even running up a mountain.
Another way to portray that you are a fast runner is by getting a tattoo of your favorite fast-moving cartoon. Examples of this would be Speedy Gonzales or the Road Runner. You can have Speedy Gonzales standing there or you can have him running with the a trail of smoke behind him. You can also have the Road Runner blowing past Wile E. Coyote. These tattoos can also be placed almost anywhere on the body.
Multiple footprints that are spread out from each other and heading in one direction can also portray the image of running. You can place this tattoo anywhere on your back, up your ribs, or even on your arm. You can also choose to have them be sneaker footprints, bare human footprints or even a fast animal's footprints. The sneaker prints would be the best way to show that you are a runner. This tattoo will look great in a plain black, but it can be enhanced with other colors and shadows.