Along with Padma Lakshmi, Jenny McCarthy and Christie Brinkley, Hilary Duff is part of a Danskin initiative called "Move For Change." "
This Danskin campaign is for women of all ages," the 23-year old actress said in a statement. "20s, 30s, 40s and 50s and what they like to do to stay in shape— physically and mentally in mind, body, and soul."
Getting in the spirit of the campagin, Duff donned some sexy activewear for a photoshoot.
Check out those pictures above and some behind the scenes video below.