The rapid shaking movement which involves the esthetician's shoulders and body is known as ________.

Vibration is a technique utilized in massage and esthetics that consists of rapid shaking movements created by the esthetician's body and shoulders. This technique is applied to create a stimulating effect on the client's skin and underlying tissues. It can increase circulation and enhance the overall relaxation experience, making it a popular choice in various treatment modalities. The vibration technique can be effective for energizing, encouraging tissue health, and promoting a soothing sensation throughout the treatment.

In contrast, the other techniques listed serve different purposes. Tapotement refers to a series of fast, rhythmic tapping movements, generally used for stimulation rather than the whole-body action characteristic of vibration. Friction involves rubbing or applying pressure to create heat and loosen muscle tissue, distinct from the shaking motion of vibration. Petrissage incorporates kneading and squeezing movements to alleviate muscle tension and improve blood flow, again differing fundamentally from the rapid shaking associated with vibration. This differentiation emphasizes the unique role of vibration within the broader context of massage techniques.