What Is The Popping Sound I Heard?

The treatment was not painful, but I heard a light popping sound
can you explain to me what is this sound?
The sound you may hear is not bones rubbing against one another, as some say,
neither is anything breaking, it is a release of liquid/gas mixture your joints, like the sound you hear when opening a bottle of champagne.
It is healthy and safe to hear the pops. This type of therapy is scientifically proven and highly beneficial.