The soleus is the wide, flat muscle that covers and shapes the calf region of the lower leg. The “claim to fame” of one of the trigger points in this muscle is the heel pain that many joggers and runners experience during and after exercise. It (along with the tibialis posterior trigger point) can also produce pain the Achilles tendon region as well. Other trigger points in the soleus produce pain and tenderness in the calf region and rarely even way up in the sacroiliac joint of the low back region.