You can do abdominal exercises even on your knees, which reduces the strain on your lower back, making it easy to use even for those with back pain. Length: 25cm Width: 13cm Height: 14cm Weight: Approximately 1.5kg * The characters are faint, but the display is digital. * There are minor scratches on the surface, but there are no defects. * There is no instruction manual or original box, but it will be carefully packaged. Type... Abdominal exercise machine