The gastrocnemius is a large muscle located in the back of the lower leg. It is one of the main muscles that make up the calf and is responsible for plantar flexion, which allows you to point your toes and push off the ground while walking or running. The muscle has two heads, which originate from the femur and merge to form a single tendon that attaches to the heel bone, known as the calcaneus. This muscle plays a crucial role in various activities, including jumping, running, and climbing stairs. Strengthening the gastrocnemius can improve athletic performance and help prevent injuries. Stretching this muscle is also important for maintaining flexibility and overall leg health.