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The W-wheel ab roller provides a sense of stability. While it is the main part of the abdominal muscles, it is characterized by allowing the upper body to work out unevenly. If you are using it as a exercise, you can only do the abs and back muscles with the abs roller. When not in use, it can be disassembled for storage, or it will not take up space. This is an inexpensive product that can easily train your abs without taking up much space. Characteristics: Can be used not only for the abdominal muscles, but also for the upper body without having to do a lot of dozens or hundreds of times like a sit-up; The strength can be controlled so you can train from beginners to advanced users. Effective areas that are called abdominal muscles: Abdominal oblique muscles; The lateral part of the abdominal rectulus muscleAbs positioned on the side; Triceps: muscles behind the bicep ; Spinal upright muscle: areas called "back muscles" around the spine.