Final answer:
The massage movement involving kneading the muscles between the thumb and fingers is known as petrissage. It is designed to manipulate muscle layers and relieve tension while enhancing circulation.
Step-by-step explanation:
The massage movement that is performed by kneading the muscles between the thumb and fingers is called petrissage.
This technique is used to deeply manipulate the layers of muscle and connective tissue, enhancing circulation and releasing tension. Other massage movements include friction, which applies pressure to create heat and reduce muscle knots; tapotement, which consists of rhythmic tapping or percussive movements; and effleurage, which involves soft, long, gliding strokes.