I can say that to get thick skin on your feet you need to not wear shoes at all for long periods of time and walk/run lots over harsh ground. I would go the ent

I can say that to get thick skin on your feet you need to not wear shoes at all for long periods of time and walk/run lots over harsh ground. I would go the entire summer without wearing shoes and running around all day and it would take a month to get thick skin on my feet and it would still be getting thicker by the end of summer. I would start wearing shoes and within a month my feet were back to a more standard thinness. You do retain the careful walking/running skill, but without the thick skin you can't really run effectively on gravel, etc.