A plyo box is a sturdy, three-dimensional box used for jumping, step-ups, and box squats. Plyometric jumps onto the box develop explosive lower-body power and improve vertical leap. Different box heights allow progressive overload. The soft or wooden construction provides a safe landing surface for repeated jumps, making it a key tool in athletic training and CrossFit. Box jumps also improve coordination and cardiovascular fitness. Beginners should start with a low box and step down rather than jump down to reduce impact on the joints. It is durable and versatile for home and gym use.