You probably know the game called “the floor is lava”, where players must traverse space without touching the ground. Although it is a kids’ game, it is also popular among parkour practitioners, who use different obstacles, ledges, walls or rails to avoid touching the “lava”. Here, I will argue that this game is a great example of a “naive” version of the constraints-led approach. Different versions of the game might exist, so we will start discussing an unstructured case and then examine how different variations can be used to achieve learning goals.