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fibularis longusflexes and Evert the footFibularis brevis and Fibularis longus
In human anatomy, the fibularis longus (also known as peroneus longus) is a superficial muscle in the lateral compartment of the leg, and acts to evert and plantar flex the ankle.
The bottom of the foot is called the plantar surface. Plantar flexing is contracting the muscles of the foot so that the toes move down and the arch increases.
Tibialis posterior
The action of the calcaneal tendon is to allow your soleus and gastrocnemius muscles to (plantar) flex your foot.
Plantar flexion is the act of flexing the muscles of the toe and foot toward the sole. the muscles involved in this process are often stretched which for some, can reduce heel pain and the pain caused by flat feet.
You have gastrocnemius and soleus muscles on the back of the leg. They have common insertion in the form of tendocalcaneus. On the front side you have muscles of peroneal compartment to antagonize the calf muscles.
When you walk, there is plantar-flex-ion. So main function of foot is walking. So for planter-flex-ion you need more movement and power to lift the body weight. Power is provided by powerful muscles, those are Gastrocnemius and Sole-us muscles. (Calf muscles.) For Dorsiflexion you do not require much range of movement and power to lift a small body part, that is foot itself only.
The Gastrocnemius and the Soleus flexes the knee and the foot. The Plantaris is an unimportant muscle. Many people do not have it and doctors tend to use this muscle for tendon graphs.
to make it tight
Your hamstring muscles.
hamstring group of muscles