She performs 44 songs from all her 10 albums over three and half hours at each of her Eras Tour concerts, all while undergoing multiple costume changes.

And with dozens of shows to go, many are wondering how Taylor Swift is going to survive her world tour.

In Sydney last week, the Cruel Summer songstress played four shows back-to-back across four nights – a total of 10 hours and 30 minutes – without showing the slightest ounce of exhaustion.

The pop megastar said she knew what she was facing before she embarked on the tour, and came very wellk prepared.

‘I knew this tour was harder than anything I’d ever done before by a long shot,’ she told Time magazine last year.

How Taylor Swift performed four nights back-to-back for three and a half hours on her Eras Tour in Australia – and the one thing she gave up to do it.

The pop powerhouse took extreme measures when it came to being in tip-top shape for the global tour.

She started training six months before it kicked off at a New York City-based gym called Dogpound – a ‘state-of-the-art’ facility ‘offering bespoke team, private training, lifestyle advice’.

She performed her entire setlist while running on a treadmill so that she would be ready to belt out her hits while dancing around the stage.

‘Every day I would run on the treadmill, singing the entire set list out loud,’ she told Time magazine.