Final answer:
Gliding strokes on the arm should be applied in the direction towards the heart to facilitate venous blood flow and promote relaxation and circulation.
Step-by-step explanation:
When applying gliding strokes to the arm, pressure should be applied in a direction that is generally towards the heart. In professional massage therapy, gliding strokes are often used to promote relaxation and improve blood circulation. Applying pressure in the direction of venous blood flow - that is, towards the heart - helps facilitate the return of blood and can be beneficial in preventing varicose veins and other circulatory problems. This technique is important for optimizing the effects of the massage and providing therapeutic benefits to the client.