What is the purpose of performing the t-spine rotation drill from the quadruped position with one supporting arm on the ground?/2022

What is the purpose of performing the t-spine rotation drill from the quadruped position with one supporting arm on the ground?

1. TO PROMOTE ACTIVATION OF THE PECTORALIS MUSCLE IN THE SUPPORTING ARM
2. TO MINIMIZE T-SPINE EXTENSION
3. TO PROMOTE ACTIVATION OF THE SERRATUS ANTERIOR IN THE SUPPORTING ARM
4. TO PROMOTE LUMBAR FLEXION