The robust, economical option for plyometric training. Constructed from tough plywood that has been cut to shape with a computer-controlled router. All corners employ box joint construction secured in two axes by screws, then the edges are sanded off so that missed jumps aren't quite as intimidating. Porthole handles make it easier to move around and facilitate in turning it from side to side to take advantage of the three different dimensions to create jumps of 20, 24 and 30 inches in height (that's where the 3-in-1 thing comes from).