Xiaopengs?

This is what I do for Xiaopeng Forwards:

 

1. Start with body away from shoulder being worked

2. palms facing the front

3. bring arms up (when arm is being bought up, the palm will automatically face the back at the top)

4. rotate only the forearm to bring palm facing front again

5. rotate the body until your shoulder goes behind your back (don't move the shoulder, the body moves automatically for shoulders)

6. brings arms down, and repeat

 

That feels right for me at least

That's pretty much how I've done it alan, and my shoulders feel amazing from them.

The trunk twist covers the majority of the turn for you, but still twist at the shoulder for the downward motion during forward xiaopeng