A sheet or web supported by springs in a metal fram and used as a springboard?

A sheet or web supported by springs in a metal frame and used as a springboard is typically referred to as a "trampoline." It consists of a strong fabric surface that is stretched over a series of springs, allowing for elastic rebound when jumped upon. Trampolines are commonly used for recreational activities, gymnastics, and acrobatics, providing a fun and safe way to perform jumps and stunts. The design allows for both vertical and horizontal movements, making it versatile for various forms of exercise and play.