The purpose of yielding/shuai jiao is to counter a punch,
kick or grapple using skills acquired through training the
yielding exercise and
shuai jiao basic skills.
Yielding/shuai jiao involves evading the attack, softly meeting, then
redirecting the opponent.
At the opportune moment shuai jiao can be employed.
Yielding/shuai jiao is pretty much the same as
yielding/chin na, except that the goal is to
apply shuai jiao applications rather than chin na.