I first heard of it online in an article but can't remember what site as it was years ago. Was always interested and wished I was taught how to do it. Never tried on my own because I was afraid to stupidly injure myself. I saw videos of it and witnessed it in Okinawa before finding my current teacher who teaches it as the standard method. I saw a man kick a hole in can with that toe kick. Scary stuff if you imagine being on the receiving end! Both front kicks and roundhouse kicks are done with toes. Feels like getting jabbed with a sharp stick. Common targets are the solar plexus(highest target), liver and bladder area. Also many points on the thigh and legs