Heel lifts (not only for high heels, look at any pair of men's dress shoes), arch support (which causes weaker natural arches), and fashionable "narrow" toed shoes that deform the feet. Overtime we become weak-footed, lose our suppleness, and the shape of our foot changes. Solution? Take your shoes off, let your feet breathe, and go barefoot more often. Opt for Earth Runners when you must wear shoes, as they allow your feet to function naturally.
