It is mainly used to exercise abdominal muscles, such as the rectus abdominis and external oblique muscles. 

Through sit - ups, crunches and other movements, it can effectively strengthen the abdominal muscles, reduce abdominal fat accumulation, and shape the abdominal lines.
It assists in stretching and strength training of the waist, helping to improve the flexibility and strength of the lumbar muscles, prevent lumbar diseases, and relieve lumbar fatigue.
Some movements can use the equipment for auxiliary leg training. For example, use straps for leg stretching and strength exercises to train leg muscles.