Pogo stick

A device with a spring and footrests that lets a person bounce upright by repeatedly compressing and releasing the spring.

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Helical spring: A coil-shaped spring that stores mechanical energy when compressed or extended. Most pogo sticks use a coil spring to store energy under the rider’s weight.
Spring (device): An elastic mechanical element that returns toward its original shape after deformation. The pogo stick is built around a spring that repeatedly stores and releases energy.
George Hansburg: An American inventor and businessman associated with the commercial pogo stick. Hansburg developed and marketed a practical pogo stick in the early twentieth century.
Pogo stick tricks: Moves performed on a pogo stick beyond ordinary repeated bouncing. Tricks extend basic bouncing into spins, flips, and other controlled maneuvers.
Space hopper: An inflatable ball with handles that a seated rider propels by bouncing. It provides bouncing play without a rigid frame or mechanical spring.
Hooke's law: A physical law stating that a spring’s force is proportional to its displacement within its elastic limit. It approximates how the pogo stick’s spring pushes back during compression.
Lever: A rigid bar that turns around a pivot to transmit or multiply force. The handlebar acts as a lever for steering and stabilizing the upper body.
Pogo stick patent: A patent covering an early spring-powered jumping device associated with George Hansburg. The patent history records how the device’s recognizable form was developed.
Extreme Pogo: A form of pogo-stick sport involving advanced tricks, obstacles, and high jumps. Specialized spring devices let athletes perform stunts beyond ordinary play.
Trampoline: A tensioned fabric surface supported by springs or elastic bands for jumping. A trampoline supplies rebound through a shared surface rather than a handheld device.