Descriptions Note: Only compatible with the M2S, M3, M3S Megaformer.The M3 Carriage S-Strap is primarily used to secure your feet to the carriage to avoid slipping and losing control of the carriage. It also improves traction and increases muscle stimulation. We highly recommend the strap be used for SKATING, RUNNERS LUNGE, SUPER CRUNCH, REVERSE CATFISH, and more Lagree Fitness moves. We are an Authorized Retailer for Lagree Fitness.