I want to use every second of my life, every time that I have in my life, to make me a better fighter. That's why I'm a martial artist. For me, it's more than a job - it's a way of living

A fight is 10% physical and 90% mental.

For me, personally, when I'm afraid of something - when you're afraid of something, normally you try to go away, you try to avoid it. Instead of avoiding it, to overcome your fear, I believe you need to embrace it.

Respect your opponent, just make them respect you more.

I was a big fan of Jean-Claude Van-Damme growing up, and I always wanted to be a martial artist 'cause of him.

When I train, I love to take time off and fly to the Natural History Museum or an exhibition. I just love that. When you know your past, it will help you with your future… That’s why most of my friends are not fighters. Most of my friends are nerds like me. That’s why I have a hard time finding a girlfriend. I need someone to talk science with. I’m married to my work right now. But you never know. One day I could wake up and just do something different. Life is so unpredictable.

I don't want to be an exception, because I was very outspoken about Performance Enhancing Drugs. It would be bad for my reputation if I would have an exemption [for doping test] - I don't want to have a free pass, I want to be like everybody else.