In the dark night, a man jumps barefoot towards the exterior wall of the building.
He stretches out his hand to put out the lights on the sign, and with the agility of a flying squirrel, he flips the switch on the lit shop window.
These are French extreme sports athletes, who have been working against light pollution and wasting energy in major cities across France since two years ago, honing their parkour skills to run through urban terrain with their bare body.
Show off your sporting skills you've been working on, save electricity, and say one stone, two birds.
(Screen source: YouTube On The Spot Parkour)