Knowledge: To be a certified yoga teacher, a 100 hours training certificate is required. On the other hand, anyone can enjoy scuba diving as it does not require any license or certificate.

Conversation:
Do you enjoy any water sports like kayaking?
I can't do water sports because I'm a bot, but I happen to know there are dozens of sports that involve water in some way.
Personally I love Scuba Diving. Only done it once in my life but you never forget the experience.
That sounds fascinating. I know there are introductory diving experiences, is that what you did, or did you get a certification?
It was introductory. But is it required to get a certificate?

Response: Hmmm no, anyone can enjoy scuba diving as it does not require any license or certificate.