5. Christie Brinkley
Christie Brinkley doesn't seem to believe in down time. The active model, artist, philanthropist, environmentalist and mother of three told Shape.com she crams exercise into "boring" activities like drying her hair: "I'll dry my hair as though I'm sitting on a chair, even though there's no chair there. Then I'll do some squats ... you can do so much for your upper legs while you're drying your hair."
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