In the 90's we barely had internet, much less the constant stream of video from personal cell phones that we have today. Imagine a world lit only by fire, and then take YouTube away. You're going to have a hell of a time trying to find videos of tournaments from then because most of them are on VHS in someone's attic somewhere. Even as late as 2001, we were making most, if not all, recordings on tape. Digital music was just making its introduction to the world (I miss Napster some days.) and digital video was only for the wealthy and it sucked.But how would you write it if you never experienced it? So many told me I need the experience. I will do my research but I can't find any teen match tournaments with kung fu, even karate
I've got a long history of violence, but I've never killed anyone. Doesn't stop me from writing about bloody murder. I've never been a man. Doesn't stop me from having male characters. I've never been a POC. Doesn't stop me from having characters of color.
So, what do we do when we've never ridden a dragon? We simulate experiences. I've done many, many experiments to get the feel for what I'm writing about. I've stabbed a t-shirt filled with colored water balloons to death. I've ridden roller coasters. I watch a stunning amount of YouTube and my reference library bends the shelves. We're writers. We do homework for a living. You don't need to have done the actual activity itself - though it doesn't hurt - to write about it. Just do your homework, maybe take some classes if you're able, definitely buy some books, and you'll learn something about your story and about yourself.