Last year I started a small business! I opened a yoga studio! We have fewer employees and less annual revenue than a regular-sized business.
That's awesome!  I'd love to start doing yoga.
It's very nice. I've been doing it for about 10 years. The most common types are Hatha and Raja yoga. It's very transformative.
When did Hatha Yoga begin and from where did it originate?
It originated from India and is credited to the Nath yogi tradition of Shaivism. 
Interesting.  I should have known that it originated in India.  How many different forms have originated?
I don't know exactly how many there are, but "hatha yoga" usually implies the physical techniques that we often see in classes.
I've heard of hot yoga before.  Does that involve any specific type of Yoga?
Yes absolutely. The postures are the same, except hot yoga is performed under hot and humid conditions! It's also a little more challenging!
I'd imagine stretching would be important before doing yoga.  Or is the act of yoga stretching in itself?