Abdominal 4 Wheels Ab Roller Workout Reduce Injuries Exercise Suit For Beginner Home Gym Fitness Equipment. Exercise the waistabdomenchestarm and shoulder muscles. The roller wheel is perfect for different venues and different positionswhich is also the ideal exercise equipment for old and young men and women. When pushed to a compact state the abdominal roller wheel will be rebounded to reset easily and to exercise your abdominal muscles.