Power Pony

. A ponytail? What am I, 12? But we’re not talking about tying your hair up for HIIT class or staggering through your skin care routine. These are ponytails with purpose: high-swinging, high-gloss arrangements with their roots in high fashion. (Less Disney Channel, more Madonna’s Blond Ambition tour.) Ponytails have topped off all sorts of glamorous folks…