Barefoot Walking Gives You Calluses That Are Even Better for Your Feet Than Shoes, Study Suggests

Going Barefoot Helps Your Feet Develop Natural Padding Protection

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Chris Townsend Outdoors: July 2019

Does going barefoot cause calluses? - Quora

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偶爾踢掉你腳下的鞋子，研究：赤腳走路能增加腳-腦神經連結

What are the consequences of always walking barefoot? - Quora

Callouses Happen — The Gait Guys