The front parts of your legs between your knees and ankles.
From Old English scinu, related to Gothic skina (leg). The word has been used for this body part for over 1,500 years with little change in meaning.
Your shins are surprisingly vulnerable because there's almost no muscle or fat protecting the bone underneath—just skin—which is why kicking something solid hurts so much. Athletes often train their shins to handle impact, which actually strengthens the bone through a process called bone remodeling.
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