
Celebrity fitness expert Harley Pasternak, who works with Fox, says the 24-year-old struggles to gain weight because of her "fast metabolism".
"She gets frustrated at times because she's like 'I need to put on weight'. So she actually weight-trains to keep on that lean muscle tissue," said Pasternak.
"Believe it or not she has this really fast metabolism. So her training is all about body toning and sculpting. It’s really about she's eating enough of the right things or not. People thought, 'Oh she must be anorexic', but she's far from that!" he added.
However, it seems Fox's struggle to be curvy seems new as her shapely figure was quite visible in the first Transformers movie.
"The key to Megan's abs is first of all genetics. The second is that we train her abs on all three planes. It's not just about crunch, crunch, crunch. It's about working her body up and down and side to side and rotation,” Pasternak said talking about the actress' workout routine.
"We train all three of her rectus abdominals, her oblique and her corset muscle to make sure that her abs are not just tight and strong but small. The corset pulls it all in," added Pasternak.
Nevertheless, the trainer himself admits he is concerned that Fox is losing her curves.
"Do I worry about Megan getting too skinny? Yeah!" he said.
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