The tibialis posterior muscle is a deep muscle located in the posterior compartment of the lower leg. It originates from the upper two-thirds of the lateral surface of the tibia and the interosseous membrane, and inserts on the navicular bone, the cuneiform bones, and the bases of the second, third, and fourth metatarsal bones of the foot. The primary function of the tibialis posterior is to assist in the plantarflexion and inversion of the ankle joint, as well as the flexion of the foot at the tarsometatarsal joints. It also helps to support the medial arch of the foot.

In terms of sports, the tibialis posterior muscle is commonly used in activities that involve running, jumping, and cutting.

It is not necessary to use the tibialis posterior muscle daily, as it will naturally be engaged during activities that involve movement of the foot and ankle. However, incorporating specific exercises that target the tibialis posterior can help to improve muscle strength and function.