Just like during the basic walk kick, one type body forward, other body side. The helper slowly stands up from deep to higher MaBu (horse stance)騎馬步. At around the limit of the stretching do firm movements to extend the limits. The one who is stretching, keeps the structure !
Body to front
HeJingHan BaguaQuan, Baguazhang Teaching Taipei.
See more videos at Youtube playlists
some materials could be added from HeJingHan book:
Bagua Quan Foundation Training