Nayoya Abdominal Mat for Full Range of Motion Ab Workouts PROVIDES firm lower back and lumbar support, stability, constant tension, and an effortless full range of motion workout for your abs and core REMOVES PRESSURE from your back while maximizing the effectiveness of crunches, sit-ups and leg lifts. HIGHLY EFFECTIVE Ab and core isolation and engagement during leg lifts, knee raises, crunches and sit-ups for increased core strength MIMICS THE CURVED SHAPE OF YOUR SPINE allowing your abs to get a proper stretch on the bottom portion of the movement followed by a complete contraction at the top of the movement REQUIRES NO SET UP: Light, portable, durable, long lasting, sturdy design that stays stable, doesn't wobble or slide and can be thrown in your suitcase or gym bag and taken with you anywhere