Descriptions The Universal Strap is used for the carriage and primarily function to secure your feet on the carriage to avoid slipping and losing control of the carriage. We highly recommend the strap for SKATING, RUNNERS LUNGE, SUPER CRUNCH, REVERSE CATFISH, and other Lagree Fitness moves. In addition, it improves traction and increases muscle stimulation.Fits the following Lagree Fitness equipment: M2S, M3, M3S, M3K, M3X, EVOWe are an Authorized Retailer for Lagree Fitness.