Trampoline, specifically an Ultrasport brand trampoline, set up outdoors. A trampoline is a recreational and competitive device consisting of a taut, strong fabric stretched between a steel frame using coiled springs. People bounce on trampolines for recreational purposes, exercise, and in sports such as trampoline gymnastics. The fabric that users bounce on is called the bounce mat or trampoline bed, and its elasticity is provided by the springs that connect it to the frame. The springs store potential energy and release it as kinetic energy when someone jumps, allowing them to bounce.
Trampolines were initially developed as a piece of equipment for gymnastics in the 1920s and gained popularity in the mid-20th century. They are now used for various purposes, including recreation, exercise, and training for athletes and astronauts.