ProSource Abdominal AB Mat 15&rdquo; x 12&rdquo; High Density Core Trainer BETTER RESULTS  Provides a full range of motion you cant get from standard sit-ups; isolates the abs for optimal workout results! NATURAL ARCH - Arch design naturally curves to the back for more effective core work that protects your lower back GREAT FOR CROSSFIT  Perfect for high rep exercises like crunches, sit-ups and leg lifts; Ideal for head protection during handstand push-ups DURABLE  High-density foam gives comfort and the perfect amount of firm support for your back and spine while challenging your core muscles DIMENSIONS: 15L x 12W x 2.5H; the compact design is one-size-fits-all and portable so you can carry it to the gym or even while traveling