I'm interviewing an Aikido practitioner, what would you like me to ask him?

I'm going to be doing a podcast with a friend of mine who is a Sandan in Aikido, Blue in BJJ & Yellow in Judo.

What questions would you all like me to ask him? The gentleman is a great guy and willing to discuss anything regarding the art. No question is too crude as long as it's an honest question and not just trolling.