Before revision: Yang Chengfu in the single whip posture c. 1930 Single Whip ( 單鞭 dān biān ) is a common posture found in most forms of t'ai chich'uan .
After revision: Yang Chengfu in the single whip posture c. 1930 Single Whip ( 單鞭 dān biān ) is a common posture found in most forms of tai chi .