The phrase "a runner on a" is correct and usable in written English.
It can be used in contexts related to sports, athletics, or any situation involving running or racing.
Example: "During the race, a runner on a team was able to secure the lead."
Alternatives: "an athlete on a" or "a competitor in a".
No wonder Gilles ends up in Pinewood working as a runner on a Nazis-and-dinosaurs movie.
Then, out of the blue, Evans was offered a job as a runner on a new website for deaf people.
Since its launch in 2015, OakNorth has moved like a runner on a treadmill at full speed: rapidly, and seemingly without encountering a bump in the road.
A few weeks ago I passed a runner on a leafy lane who looked like he'd been hammering the tarmac for many decades.
"The degree of cushioning that may be of use to a runner on a concrete footpath may be reducing sensitivity to feedback information from the foot (and potentially increasing injury risk) in individuals who play court and field sports that require rapid changes of angle and direction," Dr. Waddington said.
The idea is to keep levels within an ideal range, much as a runner on a treadmill might sustain a target heart rate.
Or the distance the light traveled to reach us (which includes some extra distance because the universe expanded while the light was moving through it, like a runner on an ever stretching racetrack)?
Teams with a runner on second and one out scored an average of 0.682 runs, meaning their chances of scoring decreased if they sacrificed the runner ahead.
Everybody says strikeouts aren't such a bad thing — well, I think it's a real bad thing with a runner on third base and one out.
After he replaced Sabathia with one out and a runner on first, he got a second out but then gave up a ringing double off the left-field wall to Gomes, putting runners on second and third.
In the third inning, with one out and a runner on first, Gonzalez fired a 92-mph fastball down the middle of the plate.
