Zheng Xinyi is a famous body-building institution in Hong Kong. The instruments used are extremely expensive. Moreover, Zhang Yushan, the owner of the gym, specially sent a slimming expert to live with her to supervise her, and invited a nutritionist to help her cook a diet meal suitable for her physique, so she could lose so much weight in half a year. In the book, she lists her diet, and she also makes it clear that this diet is only suitable for people with the same physique as her, and not everyone has an effect.
Therefore, it is still necessary to understand your own physique.
In fact, to put it bluntly, there is no way to lose weight, it is nothing more than dieting+exercise! Mainly depends on whether you can persist and have perseverance.