Runner's unit is a term used to describe the distance and speed of a runner. It is composed of two parts: mile and STRIDE. A mile is a unit of length equal to 1, 609 meters, or 5, 280 feet, and is commonly used in running races. A STRIDE is the distance between two successive steps taken by a runner, and is usually measured in feet. Together, these two units provide a measure of the distance and speed of a runner.