These body type classifications have their roots in discredited pseudoscience—but they're still common shorthand at the gym.

Endomorphs tended to be shorter, stockier, and more prone to weight gain. Mesomorphs were those ... does have slight variations between men and women (mostly to account for wider average hip ...

This body type typically carries more fat and has a naturally slow metabolism, causing endomorphs to gain fat quickly and ... fat than endomorphs assigned female at birth and the other two body ...