Not necessarily: Many possibilities including body type, genetics as well as training routine. Of course certain biomechanical pathology as well as other conditions can also be factors.
Answered 8/12/2013
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Unlikely: The soleus is a primary propulsive muscle in running. It may be difficult to differentiate it from your gastrocs visually . It is extremely unlikely that this is due to ankle or hip instability as these muscles don't stabilize the hip. Ankle instability usually presents with a history of frequent ankle sprains. Your personal musculature is probably a result of genetics and your environment.
Answered 10/9/2013
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