It effectively activates your core muscles. FEATURE Preferred Material Provides more stable support and safe exercise, it also provides comfort for your arms, and makes you more "inclined" when doing plank exercises. Safe and Secure Angular mechanics triangle design, positive timing, countdown design, you can plan your exercise time reasonably, monitor in real-time, and control the exercise time yourself. Comfort Grip Soft grips for easy grip, comfortable training, patented design and contoured cushioning give you personalized support by relieving stress on your joints. Counting design use button battery. Adjustable Angle Contract your abdominal muscle through a full range of motion and keep your back from arching. Whole-body movement makes exercise more effective. SPECIFICATION Material: ABS, Sponge Product size: about 52*32*15cm/20.5*12.6*6in Weight: about 0.65kg PACKAGE INCLUDE 1 * Multifunctional Portable Plank Abdominal Muscle Trainer