New Modern Movement Edge Board Extension Trainer M Trac App Syncable Grey 38 optimizing designs for maximum performance 340471 33 23 Used optimizing designs for maximum performance focused beam of high definition light that has been created specifically for game identification in a hunting situation Sync with M Trac App to create a seamless integration of technology and strength Track results on device log number of reps and range of movement & store workout history Project M Trac onto a monitor or TV for easier viewing Curved wheels enable arcing turns that engage a wide range of muscles Braking action stops movement at any point start with short extensions and gradually increase over time Designed to create instability that works to build your core Ergonomically designed handles Removable device tray