I agree. Unless you're applying for a job that involves martial arts, I'd use a different topic. Not only is the demonstration hard to make interesting to an outsider, it's possibly going to turn off the interviewer.I'd work out what you like or passionate about more in line with the nature of the job. Work out the qualities they are looking for, and what you enjoy that can reflect and enforce those qualities.
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Well thanks for everyone's help. The goal was to make them interested in something. My plan was to give information about wing chun and then how it's benefitted me.
Here was the structure of my presentation in bullet points ...
If he gets the job, we'll all start doing wing chun at job intervierws
First, I'm very sorry you didn't get the job. But, it sounds like you've already got another iron in the fire. Good luck!
Have you ever worked in sales or in retail? When you say, "telling" vs "convincing" I immediately thought of the difference between a feature and a benefit. In sales, the concept of features vs benefits is fundamental. The idea is that features don't sell a product. Benefits do. The key difference boils down to relating the benefit to your customer.
So, in the case of your interview, this is what I was hinting at when I said that the presentation isn't about WC. Rather, it's about you. Every time you're trying to influence an outcome, whether it's to sell a product, sell yourself (ie, get a job) or to sway someone's opinion, you have to relate to what that person wants or needs. For example, fuel economy in a car is a feature. That is not a selling point. Instead of saying, "This car is fuel efficient" (feature), focus on the benefit, "The fuel efficiency of this car will save you money every month. (benefit)" It's a subtle distinction, but is fundamental and absolutely critical to understand.
Presuming that the feedback you received is on the mark, and that you can stand to do more selling (or influencing or convincing or whatever you want to call it) and less 'telling,' a useful exercise for you might be to bullet out your own strengths. What are your "features?" What do you bring to the table to a prospective employer? Just bullet these items out. Then, for each one, think about how that "feature" translates into a tangible benefit to the employer.
I hope this helps.
Edit: Just want to add, if you google "features vs benefits" you'll get a lot of tips on this very basic sales concept.