The peroneus longus muscle is located under the skin on the outer side of the lower leg, and the peroneus brevis muscle is located deep within the peroneus longus muscle. The peroneus brevis is a group of muscles in the leg that usually includes the peroneus longus, peroneus brevis, and the third peroneus brevis. The peroneus longus muscle is located on the outer side of the fibula, in the outer region of the calf, and the peroneus brevis muscle is overshadowed by the peroneus longus muscle. The tendons of the peroneus longus and peroneus brevis pass through the deep surface of the upper and lower supporting bands of the peroneus brevis muscle, turn anteriorly through the posterior aspect of the lateral ankle, and end at the metatarsals. The peroneus longus and peroneus shortus muscles are important foot valgus and ankle plantarflexion forces. In daily life, sitting for a long time and keeping the feet in the same position for a long time may lead to weak peroneus longus shortus muscle and symptoms of lateral calf soreness. It is recommended to exercise the peroneus longus shortus muscle appropriately in daily life, which is helpful for stabilizing the lower limb and improving the flexibility of the ankle.