Foot biomechanics studies the movement, structure and function of the feet and their influence on the overall mechanics of the body. It focuses on the way the foot absorbs shock, maintains balance and transfers forces during walking and standing. The biomechanical characteristics of the feet have a significant impact on the pelvis and spine because the feet represent the foundation of the human body and the first contact with the ground. The biomechanics of the feet are essential for the proper functioning of the entire body. Ways the foot affects the pelvis and spine include: pronation, supination, leg length, muscle activity and stability, weight distribution, shock absorption, postural adaptations, and footwear. Foot deformities are structural irregularities that can affect foot function and cause pain or discomfort. They can be congenital or acquired and can affect the bones, muscles, ligaments and tendons of the feet. The most common foot deformities include: splayfoot, hallux valgus, flatfoot, pronated foot, clubfoot, pes equinus, twisted foot, plantar fasciitis, and calcar calcanei. Problems in the structure or function of the feet can cause compensatory changes that negatively affect the pelvis and spine. Prevention and correction of these problems through orthopedic insoles, proper footwear and targeted exercises can help maintain the health and functionality of the musculoskeletal system.