I decided to write this article about Body Types: Ectomorph, Endomorph, and Mesomorph for educational purposes. One size does not fit all. This is not only true with clothing, it is quite appropriate to state this when it comes to either losing weight, gaining muscle and maintaining your figure. Your body type matters when losing weight or trying to achieve your goals. While willpower, hard work, dedication matter when it comes to sticking to a regimen, knowing the science behind your genetic body type might serve you well.