In my opinion, none. Some will tell you that you stimulate the inner/outer Gastrocnemius when you move your toes in and out. I keep my toes forward, always have and my calves are in proportion with my arms.
There is a difference in doing a standing calf raise versus a seated though. With a seated calf rasie you only hit the Soleus, standing you will hit the Gastrocnemius. The Soleus lies underneath the Gastrocnemius and is not visible.



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You should barely be able to walk after this workout for the first few weeks.
