Inclusion Criteria:  Aged 18 years and over. Used to running at least 5kms in the last 1 year.  Exclusion Criteria:  Are currently using a prescription orthotic. Have any ongoing pain or deformity in the foot. Have been advised by a doctor to not exercise due to a serious health condition. Have undergone any surgery in the last 6 months. Have undergone any surgery on the foot during lifetime.