Two pieces make up this trainer, a 35.0 by 15.0 by 0.7 inch wooden deck and a 20.9 inch roller with a 3.9 inch diameter, together producing the free lateral roll used in surf and ski conditioning rather than the fixed pivot of a rocker board. Magnetic stoppers reposition along the underside by hand, shortening or lengthening the roll travel so a beginner starts inside a narrow band and widens it as control improves. No tools are needed to move them and they hold position through a working set. Multi-layer solid wood carries up to 441 pounds and a cork base grips tile and timber flooring. Combined weight is 12.3 pounds, and the built-in handle plus the supplied storage rack keep the deck and roller together against a wall instead of rolling loose across a room. The setup suits balance conditioning, joint mobility work and off-season training. Wipe both pieces clean with a damp cloth.