Is cracking your knuckles good for you?

(CNN) – Science surprises us again.
A study finds cracking your knuckles is actually good for you.
Researchers looked at the ultrasounds of 400-knuckles to find out what exactly is going on inside a joint that’s being cracked.
They say those who cracked their knuckles had increased flexibility after doing it.
Scientists think when you crack a knuckle, you pull apart two surfaces of the joint.
That brings down the pressure in the joint and allows the gas in the fluid to dissipate.
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