For all my years of running, my feet have held up pretty well. My hips and knees have had various maladies over the years but feet and ankles (especially after I gave up soccer and basketball) have never given me any major problems. Until recently.
A few months ago, I started feeling a hard, sometimes painful, but mostly annoying, spot on the ball of my foot. It didn’t bother me too much when wearing sneakers and excercising but I definitely felt it when I was barefoot. Without any padding, it felt like I was walking with a quarter under my foot.