What is the main function of the gastrocnemius muscle?

The primary function of the gastrocnemius muscle is to flex the knee. This large muscle, located at the back of the lower leg, works primarily when you flex your knee, such as when you perform actions like walking, running, or jumping. Additionally, the gastrocnemius also plays a role in plantarflexion of the foot—pointing the toes downward—when the knee is extended. However, its most significant and direct action is indeed knee flexion. This muscle is essential for movement and contributes to the stability and propulsion during various physical activities.