Note that you wouldn't need to build up your feet if you went barefoot from birth as nature intended. What you're actually doing by "building them up" is getting them back to their natural state. Regardless of whether you have been mostly barefoot since birth, you can still build up your feet barring a medical condition, there is no such thing as a permanent tenderfoot.
Walking on gravel is an excellent way to develop the soles of your feet quickly. A few jaunts daily will thicken and toughen your soles in a few weeks. (It is within the realm of human capability to run barefoot on even the most punishing gravel with little discomfort.)
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if I have flat feet? |
if I get a blister? |