Hollywood actor Paul Rudd is always a symbol of youthfulness.

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But now the actor shares some of the difficulties to keep his perfect physique.

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The actor shared that training for the new project was a lot more difficult.

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The 53 year-old-actor is the cover star for 'Men's Health.'

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He told that getting fit for the film was "so much harder."

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He said, "I had fallen off more than I had in the past."

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He further added, "All of a sudden my clothes fit tight."

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However, He credited determination and work ethic as essential keys to fitness.

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Recently, His upcoming movie Ant-Man 3 is all set to release worldwide.

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Currently, The movie is in its early premiere for critics.

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