Hello to everyone!* I* am writing from Italy, this is my first post here. I have got* some question about the kung fu stances many consider them only a exercise fot the Muscle o for the chi, but**I Think who there is more*now my questions are:

1- How can you apply the stance especially , pu bu,* crane stance, ecc.ecc.in a real street fighting, o a free sparring like Sanda?

I Just found a video about the Back stance,*

https://www.youtube.com/watch?v=7lInNgYAiUI
*
but I am* I**am italian I Cannot**understand, what he's saying, somebody could write here what he's saying,and what the stance chinese name of the video?**I know the on kung fu are used many name for the back stance*San chi pu, Siu liu bu 60-40 for six stance, and sitting stance at back.* Is correct San chi pu?