high speed jaw opening exercise

[lebronmaxxing]

i recently made a thread asking how to improve my hyoid, someone said that i should do high speed jaw opening exercises. so im wondering how to perform them, i've tried searching, but have found different methods to do them. i want to know if someone knows how to do it properly since i don't wanna risk damaging something.

 

[killyourselfASAP]

see hyoid botb