'I had to do a lot of weightlifting': Actress Emma Stone reveals she gained seven kilos for her role as Billie Jean King in Battle Of The Sexes to try to look like 'a machine'

She's the Oscar winning actress who made her debut as tennis legend Billie Jean King in Battle Of The Sexes earlier in the week.

And after revealing she had to put on seven kilos of muscle for the role, Emma Stone said it wasn't as easy as it looked.

Speaking to the Herald Sun, the 28-year-old star said her body was not built to resemble an athletic shape.

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A challenge: On Sunday, Emma Stone revealed she found it difficult gaining 7kg of muscle for her role as Billie Jean King in Battle Of The Sexes 

A challenge: On Sunday, Emma Stone revealed she found it difficult gaining 7kg of muscle for her role as Billie Jean King in Battle Of The Sexes 

'Billie Jean was very muscular so I had to do a lot of weightlifting,' she said. 

'She was very powerful and played a very, very aggressive game. My body is not naturally like Billie Jean's, obviously.' 

'She is a machine and such a natural athlete, whereas I'm not athletic at all,' she continued.    

Getting into character: 'Billie Jean was very muscular so I had to do a lot of weightlifting' 

The person behind it: Her transformation for the role wouldn't have been made possible without her celebrity trainer Jason Walsh (pictured)

The person behind it: Her transformation for the role wouldn't have been made possible without her celebrity trainer Jason Walsh (pictured)

But her transformation for the role wouldn't have been made possible without her celebrity trainer Jason Walsh, responsible for the bodies of some of the biggest household names including Justin Theroux , Milo Ventimiglia as well as many Victoria's Secret angles including Sara Sampaio and Irina Shayk.

Speaking to E! Online, Jason said Emma's transformation took a caloric increase through protein shakes and a lot of sled pushes. 

'Emma took it very seriously,' he said. 

She took it seriously: Speaking to E! Online, her trainer Jason Walshe said Emma's transformation took a caloric increase through protein shakes and a lot of sled pushes

She took it seriously: Speaking to E! Online, her trainer Jason Walshe said Emma's transformation took a caloric increase through protein shakes and a lot of sled pushes

(L-R) Jason Walsh, Emma Stone, Billie Jean King: 'This is somebody's story that she's taken on. She wanted to make sure she could do everything possible to portray Billie Jean King in the right way'

(L-R) Jason Walsh, Emma Stone, Billie Jean King: 'This is somebody's story that she's taken on. She wanted to make sure she could do everything possible to portray Billie Jean King in the right way'

'This is somebody's story that she's taken on. She wanted to make sure she could do everything possible to portray Billie Jean King in the right way.' 

To mould into her new shape, her trainer revealed they worked together five days a week and twice daily for four of the days.

But it wasn't all work for the star who was able to deadlift nearly 85kg as she was regularly seen appearing in happy selfies taken mid-session with Jason on his Instagram account. 

Working hard: To mould into her new shape, her trainer revealed they worked together five days a week and twice daily for four of the days 

Working hard: To mould into her new shape, her trainer revealed they worked together five days a week and twice daily for four of the days 

  

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