This is a chiropractic adjustments tutorial. The specialist's name is Oleg Goodwin (inst @massage_training_a_top). This video is a part of the session which included diagnostic assesement, strong and intense back massage and chiropractic adjustments. During the video Oleg is describing what he is doing in detail, explaining everything and sharing interesting information with us so I strongly recommend you to watch till the end.
In this video you can find a lot of cracks: loud neck cracks, back, shoulder finger cracks etc.