Running Races in Folkestone?

A Vintage Photos Theme Park photo for the theme of shape up! (people exercising).

This is an early twentieth-century real photo postcard with the name "Lambert Weston & Son, Folkestone" embossed in the lower right-hand corner (the embossing isn't really visible in this image, unfortunately).

The photo shows a number of men who are getting some exercise by running a footrace. The runners, strangely enough, are wearing neckties and white shirts more suitable for an office than an athletic field. A large crowd has gathered to watch the competition, and a large round building is visible in the background.

The building in the background appears to be one of the Martello towers--"small defensive forts that were built across the British Empire during the 19th century"--and might be one of the towers that are located in Folkestone, Kent, England.