To portray Marilyn Monroe, one might think that all actress Michelle Williams had to rehearse was her rendition of "Happy Birthday, Mr. President." But to bring out those killer curves, Williams turned to yoga. Regular yoga sessions have long been Williams' go-to workout of choice, so when she got the role, simple tweaks to the routine allowed her to increase her core strength and tone up her gams to create the illusion of buxom curves. Plus, the regimen gave her piece of mind. "Yoga gave me relief like nothing else; it made me a better person and a better mother. I could come back to my daughter anew," Williams told Marie Claire magazine. Get balanced and bodacious all while posing. Om!