Just a bunch of parkour maniacs playing "the floor is lava" on a series of granite pillars
A parkour team called Storror headed to an art installation in Portishead for the makeshift challenge

While the non-athletes of the world content themselves with the bone-busting possibilities of running up and down stacks of milk crates for the internet’s amusement, a group of parkour enthusiasts are showing off their ability to even more impressively risk life and limb by locating a bunch of granite pillars and filming themselves playing “the floor is lava” on them.
The parkour team Storror headed to the Full Fathom Five sculpture in Portishead, England in order to jump all over an installation comprised of 108 granite pillars of varying heights without touching the ground. The opening of the video establishes that the pillars’ spacing is tricky to gauge and that some of them wobble when pushed, but that doesn’t stop the group from using them as the basis for a rousing game designed, we assume, to test the sturdiness of their teeth.