A plyo box unlocks box jumps, step-ups, incline push-ups, dips, and Bulgarian split squats — four or five movements from one piece of equipment. This guide covers four picks: foam 3-in-1 boxes for safer practice, wooden stackable boxes, and CAP's multi-size steel designs. Foam if you're new to box jumps and want to eliminate shin-bark risk; wood or steel if you're past beginner and want the stiffer landing.