Portable Flat Abs TrainerEASY TO USES Timing display, precise control of movement duration. Light weight, high appearance to exercise waist and abdomen. FEATURE Preferred Material Comfortable Fitness Equipment: Comfortable fitness experience, elastic grip and thickened support foam. Thickened elbow pad, more comfortable elbow. Safe and Secure Angular mechanics triangle design, positive timing, countdown design, you can plan your exercise time reasonably, monitor in real time,