Supination happens when your weight shifts to the outside margins of your feet. Supination is also known as underpronation. In a typical stride, your foot should roll inward slightly (pronate) so that your weight is distributed evenly across the ball of your foot. However, if you supinate too much, your foot will roll outward instead, causing pain as your bones rub against one another. People who supinate excessively may need orthotics or shoe modifications to reduce stress on their feet. Orthotic devices are often used by people with diabetes, obesity, heart disease, and arthritis. In conclusion, the supination of the foot is the rolling of the foot outward while walking. This occurs because weight is shifted to the outer edge of the foot resulting in less pressure being placed on the inner side where the bones are supposed to touch. This can lead to pain due to poor blood flow and tissue damage around the bone-skin interface. People who supinate heavily may need orthotics or shoe modifications to reduce stress on their feet.