Who knew Hayden Panettiere had all those muscles underneath her super-Heroes costume?

A little night jogging, a little Smart Water, a little ass-kicking, a little boyfriend-dumping...guess that's how she stays in such great shape!
> Hayden's Casual Dog-Walking Dress - Oct 04, 2007
> Isn't She a Little Overdressed??? - Oct 01, 2007
> She's Tired Of Rumors Startin' - Sep 28, 2007
> Teen Vogue Smackdown! - Sep 22, 2007



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