Your foot rolls inwards.
Pronation is a naturally occurring and normal motion in the foot which involves your foot rolling inwards, this can become an issue when this movement is excessive. Excessive supination is less common, this is when your foot sits on its outer edge.
Pronation of the foot occurs with every step we take to enable us to adapt to uneven terrain and dissipate shock sufficiently. When the foot over pronates there is an issue as it places excessive stresses on soft tissue of the foot leg and ankle. Excessive pronation can lead to complaints such as shin splints, plantar fasciitis, posterior tibial tendon dysfunction, knee pain, hip pain and even lower back pain. Good supportive shoes will help as well as Formthotics™. Formthotics™ are designed to reduce pronation; they do this through their unique heat moulding process and arch contour design.