Pronation is the side-to-side movement of ... In contrast, with underpronation (also called supination), the foot rolls outward. The way a person’s foot strikes the ground can affect the rest ...

Supination — also known as underpronation — is a condition in which the foot tends to roll outward when walking or running. This places a strain on toes, ankles and outer edges of the foot.

Pronation refers to the way your foot distributes impact when it hits the ground – and it differs from one person to the next. If you overpronate, your foot rolls inward when it hits the ground.