The soleus muscle is situated in the posterior compartment of the leg, forming part of the calf muscles. It is a large and powerful muscle that lies deep to the gastrocnemius.

Origin:
Originating from the posterior surfaces of the head and shaft of the fibula and the medial border of the tibia, the soleus takes its starting point from the bony structures of the lower leg.

Insertion:
The muscle inserts into the tendo calcaneus (Achilles tendon), which then attaches to the calcaneus (heel bone). This insertion site establishes a connection with the hindfoot.

Function:
Functionally, the soleus is a major plantarflexor of the ankle joint. It is actively involved in pointing the foot downward, as seen in activities like standing on tiptoes, walking, and running. Additionally, the soleus plays a crucial role in providing stability to the ankle joint during activities like maintaining a standing posture. It works synergistically with the gastrocnemius to execute powerful plantarflexion movements and is particularly active during the push-off phase of walking and running. The soleus is a key component of the calf muscles, contributing to the overall functionality of the lower leg.

Best Exercises for the Soleus
The soleus lies beneath the gastrocnemius and is most active during plantarflexion when the knee is bent. Exercises performed with bent knees are most effective for targeting this muscle.

Primary Isolation Exercises
Seated Calf Raise (Seated Heel Raise)

Supporting Movements
Heel Raise (Calf Raise)
Lunge (stabilization role)

How to Emphasize the Soleus
Focus on maintaining a bent knee position during calf raises
Push through the balls of the feet to achieve full plantarflexion
Control both the lifting and lowering phases
Avoid locking out the knees, which shifts emphasis to the gastrocnemius

Explore Exercise Technique and Execution
Each exercise listed above includes a full breakdown of proper form, muscle involvement, biomechanics, and safety considerations. Select an exercise to learn how to train the calf muscles effectively.