large indoor sports arena

large indoor sports arena. The arena has a domed roof with metal beams and supports. Banners with flags hang from the beams. On the arena floor, there are two red and blue competition mats. People dressed in martial arts uniforms are moving around on the mats and interacting with judges or referees. Other individuals dressed in civilian clothes are walking around, observing, or standing near tables with equipment. There is a rolled-up mat on the floor. Seating is visible in the background, with some spectators present. A low railing runs along the front of the area where the video is taken. Some individuals are standing near the railing, looking at the activity. The general atmosphere is one of preparation or ongoing martial arts competition.