This is called sit-ups or health nets. The usage is simple. In the picture, your feet are placed like a rope, and then people lie down and practice sit-ups, mainly for the abdomen, but I don't mind if you do this, it has no effect on the cervical spine. . Those two pink rubber ropes are tensioners. Practice arm strength. . Girls can use it, but men are useless. . Anyway, it's a waste of money, just like when I first started working out. .