A sprung wood floor consists of first a concrete slab. 2x4 planks are laid sideways and nailed together seated on top of the slab with the frame of the building to hold them in place. A springy rubber layer is laid upon the 2x4s, and then plywood is nailed down to them through the rubber. The boards are sanded and coated over and over again after being installed on site. Now, that's a nice floor.
Wood floors are high maintenance in a home.
Unlike a carpet, they collect no dust, so dust bunnies gather in corners and on baseboards. In a dojo, a sprung wood floor is a masterpiece of design and functionality appreciated by anyone with long years of training. An experienced karate instructor might run his hands along a fine, wooden floor the way a car collector gingerly runs his gloved hand across a Rolls Royce. Sprung wood saves ankles and knees much wear and tear. When you fall on it, it hurts much less than a slab floor does.