The motion is emphasised here beyond normal ranges for clarity. This is evidenced by normal wear on the outer heel of a running shoe. As the foot is weighted it must absorb shock and inward rotation of the lower leg. This is done by inward rotation of the ankle called pronation. Pronation unlocks the joints of the midfoot allowing them to cushion the shock.
Some pronation is required.
Excessive pronation or under pronation can cause injuries of the foot, knee and hip. Toe Off Supinated At toe off the foot is slightly supinated and provides a rigid lever. Normal shoe wear pattern is from the outside of the heel toward the big toe and off the middle front of the shoe. During the recovery phase the foot and leg are accelerated forward and then backwards again to match the speed of the runner before the next heel strike. Team Oregon Running Tips are Copyrighted by wY'east Consulting and Team Oregon which reserve all commercial rights to republication.