Do you know where your plantar fascia is? Chances are you don’t unless you have injured it and developed plantar fasciitis (inflammation of the plantar fascia).
When the sensitive skin on the bottom of the feet and heels becomes too dry, it can split open, leaving painful cracks called fissures on your heels. Those cracks may not only make it painful to walk, but can also lead to serious infections.
Most human feet have arches much like the ones in some bridges and other architectural structures. And much like these man-made structures, our bipedal arch turns out to be a useful engineering phenomenon.