What do you consider a good stance?

[Xue Sheng]

This would be analogous to the bullet being launched from a rooted origin.

Slow Motion Root - Bullet - Root - Bullet - Root...

 

[Sukerkin]

That was beautiful to watch, Xue - my thanks. Not my style but the principles underpinning much of movement in kung fu were evident to my Lau Gar-ian eyes .

 

[Flying Crane]

Slow Motion Root - Bullet - Root - Bullet - Root...

yup. I don't know much about xingyi, but you can see how he drives off his rear foot. He doesn't just let his body's momentum carry him into the next step. It's deliberate, controlled, and driven from the ground-up.