How to loosen finger tension
Playing instruments, cooking, lots of PC works.. Frequent use of fingers needs you to keep your hand in a same shape for a long time, and it makes your hand stiff. Please check if the space between your thumb and forefinger narrows and the point is stiff. You can loosen the point by stroking the skin over your thumb like arrow on the image and index finger too. It is because the green circle point opens by stroking.