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Medical (Symptom) Definition: "Achilles tendonitis is inflammation of the achilles tendon."

Achilles tendon =  a strong tendon at the back of the heel that connects the posterior calf muscles (gastrocnemius and soleus) to the heel bone.

Itis = inflammation (pain)

Physiological (Cause) Definition:

Achilles tendonitis is a repetitive strain injury involving lower leg muscles and tendons and their point of attachment to bones. It is typically characterized by tight gastrocnemius and soleus (posterior) muscles/tendons and typically weak tibialis anterior and extensor hallucis and digitorum longus (anterior) muscles/tendons.

Foot Trainer Exercises address the cause by relaxing tight posterior lower leg muscles and strengthening weak anterior lower leg muscles.