What is it? Everyone talks and knows about the gastrocnemius but how much do you know about the soleus? The soleus muscle is located right underneath the gastrocnemius muscle. It originates from the back of the fibular and tibia, into the heel bone via the Achilles tendon. The soleus' volume is much larger than the gastroc and provides more than double the plantarflexion (lifting your heels off the ground) force. What it looks like - Soleus injuries most often occurs during t