What are the key differences in body composition and metabolism between endomorphs, mesomorphs, and ectomorphs?

Endomorphs tend to have higher body fat and slower metabolism, making it easier for them to gain weight. Mesomorphs have a more muscular build and faster metabolism, making it easier for them to build muscle and stay lean. Ectomorphs have a leaner body type with a faster metabolism, making it harder for them to gain weight and muscle mass.