Your gastrocnemius muscles allow you to point your toes away from your body. This might not sound important, but if you do that motion while standing, it will raise you up onto your tiptoes.
Even if you don't walk around on your tiptoes all day, the ability to push your heels off of the ground enables you to walk, jump or run. This is done by contracting your gastrocnemius.
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Did You Know?
Humans have exceptionally large gastrocnemius muscles due to the fact that we stand on two legs.