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

On the plus side, endomorphs tend to be able to build muscle broadly across their body quite quickly. “An endomorph should definitely do some weight training, I’d suggest eight-12 reps ...

An endomorph is a human body type, or somatotype, characterized by a larger bone structure, midsection, and hips. This body type typically carries more fat and has a naturally slow metabolism ...