My expreince
I think that guy how kicks there has a bad shin. That normaly dont hapen. Look at the Thais for exempel. Thay kick really hard and there shins dont brake. But When I was In Thailand I kickt on there bags and that are hard as concrete. so thay harden there shins there. But dont kick on metal things and so on. But I think that you suldent be afried of braking youre shine.
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