Yoga is a group of physical mental, and spiritual practices. Do you do yoga?
I do yoga by myself.  I don't go to classes.  It's healthy to stretch with yoga.  what do you know about yoga?
I think yoga is a fine way to exercise, there are a lot of different ways to do yoga, from a broad variety of yoga schools.
Interesting.  I'm wondering how many yoga schools exist in the United states?  
I'm not sure but I know the most well known types of yoga is hatha yoga.
How cool.  I didn't even know there were different types of yoga.  I just know yoga is very healthy for muscles and I have arthritis so that would be good for me
Some say it goes back pretty far but the chronology of the earliest texts describing yoga like practices varies quite a bit.