Which of the following practices could improve blood circulation?

Improving blood circulation can be achieved through various physical activities or techniques that stimulate blood flow throughout the body. Performing circular movements is particularly effective because these motions encourage the movement of blood through the arteries and veins. Circular movements can be applied in many contexts, such as during massages, stretching exercises, or even in daily activities, helping to enhance circulation by promoting vascular health and ensuring that blood is distributed effectively to the extremities.

While other methods mentioned, like using a foot spa or massaging with essential oils, can also have positive effects on relaxation and well-being, they may not directly stimulate circulation in the same manner as active movement. Applying nail polish does not contribute to circulation at all since it is a cosmetic product that does not involve physical activity or manipulation of the skin and underlying tissues. Thus, engaging in circular movements stands out as a proactive approach to enhancing blood flow.