Why do most Japanese women have internal constellations?

Most Japanese women are in a figure-of-eight posture, which is caused by the habit of kneeling since childhood. During the Han and Tang Dynasties, China also had the habit of kneeling (tables and chairs were only available from the late Tang Dynasty to the Song Dynasty). Kneeling feet can't be completely straight, otherwise you can't sit steadily. Japanese men are just polite. Men usually sit cross-legged, so most Japanese men have round legs, which many people think are caused by riding horses. Fortunately, China no longer used couches (Japanese called tatami) in the Song Dynasty.