Sexy celebrity Jessica Biel exercises five hours a day

Biel, who is dating singer Justin Timberlake, works hard to maintain her svelte figure because she feels under pressure to look good for movie roles,

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I've worked out five hours, sometimes more, in a single day

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if I'm in training for a film role or something. And it's hard -- it's very hard!

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Despite her gruelling exercise schedule, the 27-year-old has to make sacrifices with food too and often only eats controlled meal portions.

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