Credit: Courtesy Smartwater

Jennifer Aniston's latest campaign for Smartwater, the electrolyte-enhanced bottled water she's promoted since 2007, offers fans ample opportunity to consider her famously strict workout regimen—and to admire the results. The actress and yoga devotee flaunts her enviable figure in nothing more than a sports bra and leggings, and credits the beverage with keeping her going during grueling fitness sessions. If only water alone could create such abs!