The goal of the short foot exercise is to “shorten” the foot by contracting the intrinsic muscles to raise the medial longitudinal arch, or in science-speak, pulling the first metatarsophalangeal joint toward the calcaneus (heel bone). Care should be taken to ensure the foot is in neutral alignment and that the toes are not flexed or extended. The short foot exercise is best learned seated and can be progressed to bilateral standing, single-leg standing then to functional activities such as squats, deadlift, lunges and hops. It should also be noted that being completely barefoot would enhance sensory input detection from the plantar surface of the foot and help you develop the sense of creating the short foot posture.
Read more at http://running.competitor.com/2015/08/training/how-runners-can-improve-foot-strength_134271#UkPrJtMR0xlOiK0a.99
A functional approach to improving arch muscle strength for runners.
Source: How Runners Can Improve Foot Strength – Competitor.com