Taylor Swift pushed herself to the limits while executing the Eras Tour, and in a teaser for the fast-approaching Disney+ docuseries on how she pulled it off, the pop superstar acknowledges that doing so was “the biggest challenge” of her career.

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Two days ahead of the premiere of her End of an Era project on Disney+, Swift shared an exclusive teaser for the first two episodes with Good Morning America on Wednesday (Dec. 10). The clip shows footage of the singer running intense rehearsals with her backup dancers and practicing

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