This is a video from BT Sport Boxing of a series of bouts that took place with no audience due to COVID-19, so you can actually hear the sounds of the fights. Specifically the punches landing, the coaches yelling instructions, and everything the ref says. Like silence on a Saturday

This is a video of samurai descendant Kaito Suiju, master of the Hisui school of battōjutsu and instructor at Hisui Tokyo, discussing and rating “the realism of katana sword scenes in movies, including skills of actors, the way they hold and train with the swords, as well as the choreography