This is one of two short subjects by this title from 1910. Margaret Hope tells Arthur Charrington she will marry him instead of his rival if he wins a footrace. She also slips him a short cut -- which turns out to be a difficult route to cover in this amusing film.
Charrington played Muggins, this gormless character in three or four other movies in this period, and directed several movies, and directed one of the two versions of EAST LYNNE released in 1913. This appears to have been Miss Hope's first movie, then nothing for ten years, followed by a bunch in the early 1920s and one outlier in 1930. Alas, her name is common enough I was unable to discover anything more about her.