It seems this was because the more demanding leaping, stomping, low frame, and intensive Fa jin of the advanced big frame tradition routines have been eliminated and the retained movements emphasize the training of the soft internal skills.
Fa jin, fajin, or fa chin (fā jìn, 發勁) is a term used in some Chinese martial arts, particularly the neijia (internal) martial arts, such as Xingyiquan, T'ai chi ch'uan (Taijiquan), Baguazhang and Bak Mei but also made famous by the Sao Lim Hood Kar Pai branch practiced by the late masters Abbot Sek Kho Sum and Dato P'ng Chye Kim.
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