Walking barefoot does have some health benefits:
It gives your feet an utterly new stimulus. This results in the strengthening the foot muscles (yes, they are there!).
Walking on uneven ground also strengthens muscles of the legs, hips, and butt. Strong lower body = goodbye lower back pain!
Barefoot walks are a balance challenge. Mastering those, you will get a strong core and excellent proprioception (deep feeling of your own body).
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