You peel off your running sock and – alas! – there it is: your first bruised toenail. Many runners view bruised toenails as a right of passage, but you are no less of a runner if you never get one. In ...

Tucked inside their favorite pair of running shoes you’ll find what runners consider both a disgusting side effect of the sport and a badge of honor: bruised, black toenails (if the nail is still even ...