Sivan ABPLW-BLK Abdominal Exercise Mat Core Trainer, Black Abdominal exercise mat core trainer provides full range of motion to work out all abdominal muscles Specifically designed with an arch that naturally curves to your lower back allowing for a more effective sit up  Targets and isolates abs, obliques, and lower back muscles Constructed of high-density foam for ultimate support and comfort  Light-weight design makes it easy to store or travel Perfect for home, office, gym, yoga, crossfit, boxing, MMA, and other types of training  For developing a strong abdominal core For beginner or professional use  One size fits all  Measures approximately 15x12x3