A "Rebounder" is a small, portable trampoline designed for low-impact exercise. It typically has a sturdy frame and a flexible surface that allows users to bounce safely. Rebounders are popular for fitness routines, as they provide a fun way to improve cardiovascular health, balance, and coordination. Rebounding can be done individually or in group classes, often accompanied by music for motivation. This type of exercise is suitable for various fitness levels and ages, making it an accessible option for those looking to enhance their workout routine without putting too much stress on their joints.