What is the standard kneeling posture?

Kneeling ceremony is usually very common in Japan, and there should be no accurate kneeling ceremony in China. Moreover, Japan also has different kneeling rituals because of different occasions and genders. For example, in martial arts, people who kneel must slide backwards with one foot (can't step), with one knee kneeling first and the other knee kneeling again. The distance between the left leg and the right leg is almost the space of two fists. On the other hand, when women kneel on ordinary occasions, their legs are folded, their feet are up, and their thumbs are touching together, so that their feet form a V-shape. The body is straight and her hands are doing what she should do (for example, the proportion of tea ceremony, the person kneeling is of course making tea). As for men,