My occupation is teaching yoga. I teach in a yoga school and practice Buddhism.
Nice, I'd like to start doing yoga. What kinds of yoga are there?
We teach mental, physical, and spiritual yoga.
The history of yoga interests me, too. But I don't know much about it. 
Well it originated in India.
I see. Were there famous historic figures who are known for being great teachers of yoga?
I'm not sure, but yoga gurus from India brought it to the west in the late 19th century.
Hm, I see. I would like to give it a shot. God knows I need the exercise. I wonder how many yoga schools there are in the US? I would also like to learn some martial arts.
I'm not sure how many schools there are, but yoga is more than just being physical it also involves meditation and spirituality at it's core. 
All the better. Maybe I could find a teacher locally here. There are lots of videos on Youtube too. So you teach it? There are different levels of expertise right?