Yes its a real thing. Taekwondo groundfighting has been around for a very long time. Would not be surprised if Karate had something similiar
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If you are interested the link here is for my two books that are currently on Amazon.
My first book on the Pyschology of Teaching https://a.co/d/0b82BiQr
My Second book on Structure and Alignment in Taekwondo https://a.co/d/02FY4wzc
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