sibilasibila Your question has been asked tons of times before, read back at least from page 1 of this thread.
In the meantime, the weight of the cabin crew must be
in the normal range (not below, not above) and that is calculated with Body Mass Index:
Healthy Weight: Assessing Your Weight: BMI: Adult BMI Calculator: Metric | DNPAO | CDC If the weight is borderline the limits, they take into account the proportions of the body.