Small tiles make tight spaces easy to cover. Each square in this 18-piece set measures 12.5 by 12.5 inches and 0.4 inch thick, so a mat can be shaped around a squat rack, a bike trainer or an awkward alcove rather than forced into a rectangle. High-density EVA foam takes the load off feet, knees and lower back during standing sets and floor work, and the textured face holds a bare foot or a training shoe steady through stretching and strength moves. Puzzle edges press together by hand and pull apart just as fast, and the supplied border strips finish the outside run so the layout looks deliberate. The whole set weighs 2.7 pounds and stacks flat under a bed between sessions.