because walking in general is dangerous, walking is just moving your center of mass to a place that allows you to fall in a way that also propels you forward
so for example an 80kg human exerts much more than 80kg of force on each step, but the body is able to handle that force with minimal effort because your leg bones align perfectly with the force in the moment of impact, after a ‘fall’ you just have to use your muscles to lift yourself back up to fall again, this uses less ‘energy’.
if you wear bad shoes the force you exert each step will not be aligned perfectly therefore using more energy, burdening your muscles, bones and soles of your feet with more forces than needed. Why barefoot is not bad because we’re designed to walk barefoot.
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