What exactly is the POP sound in HVLA?

[Ypo.]

im pretty sure this isnt true. i for one, am able to crack my ankles on command. im sure most of u are familar with this. (remember back in high school when u try to quietly sneak into the house while ur parents are sleeping but as u walk up the stairs, ur joints in your ankle keeps on cracking with each step). or maybe it was just my messed up feet.

im sleepy.

Yeah-tell that to my back-it can crack every five minutes as well.

There are more than one possible explanations for the popping noise-

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