Cross-trainer is a term used to describe a type of athletic shoe designed for multiple activities such as running, jumping, and lifting. There are many different synonyms for cross-trainer, including multi-sport shoe, training shoe, fitness shoe, and versatile shoe. These terms all reflect the shoe's ability to handle a variety of different activities and provide support and comfort to the wearer. Other terms that are similar to a cross-trainer include a gym shoe, activity shoe, and workout shoe. These terms all describe a shoe that is intended to be worn during exercise and offer a combination of stability, comfort, and flexibility.