Jabir Rizvi | Nutrition and Fitness Coach on Instagram: "The three main body types are ectomorph, mesomorph, and endomorph: Ectomorph: This body type has narrow shoulders and hips relative to height, and smaller muscles relative to bone length. Ectomorphs have a fast metabolism, which can make it difficult for them to gain mass Endomorph: This body type has fat deposits in the lower abdomen, hips, and thighs. Endomorphs may find it difficult to reduce weight, so they may need to combine exercise