Soft Plyobox A sports cube is used to improve bounce and strengthen the leg muscles. It is therefore a commonly used fitness tool when training sports related to jumping, such as basketball. In addition, the box can now be found in most gyms as part of Crossfit and functional training plans. You can use it to perform box jumps, split squats, raised push-ups and lateral step overs. The Plyobox adjustable sports cube has 3 different heights: 31cm, 40cm and 50cm. Depending on which side the box is placed on, the intensity of the training increases. The soft outer layer provides extra safety - small scratches and abrasions are a thing of the past. You dont have to worry about injury if you miss a jump. 3-in-1 Plyo Softbox. The Plyobox has a foam core surrounded by a foam layer of EPE and a PVC outer layer with anti-slip effect. Technical data: Dimensions: 31 x 40 x 50 cm. Material: foam, EPE, PVC. Colour: black with colourful print. Weight: 3.5 kg. Brand: ForzaFit