The 4 week Short foot exercise program improved foot intrinsic muscle activity in people with flat foot. Group B that is However, Short Foot Exercises shows better improvement in medial longitudinal arch than Group A That is Conventional Group. Key Words: Pes Planus, Flat Foot, Navicular Drop Test, Foot biomechanics, 4 week Short Foot. 5 Best Exercises for Flat Feet. Pes planus, or flat feet, is a common condition characterised by a collapse of the foot's inside arch (known as the medial arch).