The universal exercise unit, commonly referred to as the spider cage, is a structure used in neuropediatric rehabilitation to allow active and self-initiated movements and high-intensity practice of functional tasks for children with motor disorders. The spider cage helps to improve muscle strength, postural control, coordination, balance, and motor function skills.

The structure is an open metal cage equipped with pulleys, weights, straps, and elastic cords that help therapists to control the amount of sensory input, support or load needed to progress with treatment. “Spider cage” is a name given by children who were being treated in suspension systems with bungee cords.