Hey guys, Kinda pic related? I just wanted to know how to draw Dynamic poses in perspective.

I understand how to do it if the pose is static with a box and no tilts in the shoulder and pelvis is going on, but if the body is in motion I have no clue. any tips?

Pic related is by Krenz@?????02a on Pixiv

btw, there was someone here who posted a really good example of a dynamic pose in a box but I lost it. could probably help here