A "rebounder" is a small, portable trampoline designed for indoor use. It typically has a sturdy frame and a flexible surface that allows users to bounce up and down. Rebounders are popular for exercise, as they provide a low-impact workout that can improve cardiovascular health, balance, and coordination. Rebounding can be done solo or in group classes, often accompanied by music for motivation. Many people use rebounders for fun, while others incorporate them into their fitness routines. They are also sometimes referred to as mini trampolines and can be found in various sizes and styles to suit different preferences.