Mystique is essentially nude in character and she had to be in proper physical condition to play the part and she was out of shape and over weight two weeks before shooting started
The budget for this flick was around 178 million bucks and Mystiqe was a major character who could make or break the movie and its 178 million buck investment
Lawrence knew what was expected of her for the part and was in violation of her contract . No wonder the producer was freaking out .
It did not help Lawrence's case that she was following the act of super model Rebbeca Romijin , who was in great shape for the part
If it was the tryouts for Mystique, this whole thing is stupid. It sounds like they even went the extra mile of having a female do the scoping to make them more comfortable. If you’re going to take that role, you better look good on that 40’ screen. Lawrence seems to be bandwagoning here, which is consistent with her (lack) of character.