Exercise explanation, and emphasize the keep the line of force principle !
Detailed corrections and explanation 01
Keep the line of force, regardless how to practice, with or without weapon. The 穿掌擰身 (Chuān zhǎng níng shēn) shoulder stretch exercise explanation starts at 4:20. The arm the pointing forward fingers never move back, always keep the force and move forward.
Another post with 穿掌擰身 (Chuān zhǎng níng shēn) shoulder stretch exercise details with English explanation from 2018:
https://baguaquanlessons.com/2018/06/05/20180605-shoulder-stretch/
HeJingHan BaguaQuan, Baguazhang Teaching Taipei.
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[中華武育學會] 推敲太極拳/八卦盤龍
Instructor: https://www.facebook.com/hejinghan
Email us: baguaquan.hun@gmail.com
some materials could be added from HeJingHan book:
Bagua Quan Foundation Training
ISBN 978-1848190153
Class Location
Chaoyang Park， Taoyuan City
朝陽森林公園
Class Schedule for Baqua quan application
Every Saturday 14:30
Class Schedule for Tai chi quan
Every Saturday
HeJingHan Baguaquan classes 