New Modern Movement Edge Board Extension Trainer M Trac App Syncable Grey Black Brown Laces from weekend warrior pursuits to CBC 19 32 29 Used4 from weekend warrior pursuits to powerlifting or elite competitive sports This is a used XL1 from 2013 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