What is in this image? Describe it as if you were explaining it to someone from the 15th century.

Imagine a wintery scene where two townsfolk have donned slender wooden boards strapped to their feet, propelling themselves at great speeds down a snow-laden hillside. They wear close-fitting caps and suits padded for protection against the chill and hazards of their swift descent. One holds slender poles to help him navigate and maintain balance as he races past flags fixed into the snow, marking the course on this frosted slope. The landscape around them is sparse, with only a few pine trees dotting the incline. The scene you see here, they''re indulging in a daring and lively form of recreation, a test of bravery and skill on the icy terrain.