To effect vibration, the massage therapist gently shakes or trembles the flesh with the hand or fingertips, then moves on to another spot and repeats this stroke. https://heizemagazine.com/%EB%A7%88%EC%82%AC%EC%A7%80-%EC%BD%94%EC%8A%A4-%EB%8B%B9%EC%8B%A0%EC%9D%98-%EB%AA%B8%EA%B3%BC-%EB%A7%88%EC%9D%8C%EC%9D%84-%EC%9C%84%ED%95%9C-%ED%95%84%EC%88%98-%EC%84%A0%ED%83%9D/