How to represent 'character stiff' in ue4

Development Character & Animation
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we dont have Character Animator, so we dont know how to character stiff.

here is stiff example URL : 햄오나 역경직 - YouTube

this example is about AntiStiff, but almost closer what i want.

of course, there are many representation method about stiff.

but we dont have Character Animator, so we cant represent it.

in ue4, how to represent it?

tip is fine! please any tips to me…

thanks