There’s a theory that guys can be sorted into 3 distinct body type categories: endomorphs, mesomorphs and ectomorphs.
Is that true?
Different people do have different heights and bone structures. That’s a fairly uncontroversial fact. What’s far more interesting is how these traits can combine together to form groups of guys who respond to exercise and diets in fairly different ways.
For example, people don’t grow proportionally. Our limbs grow longer faster than they grow thicker. So shorter guys tend to be thicker, taller guys tend to be thinner. Then consider that being a heavier person causes your body to develop thicker bones to support the extra weight, and that having thicker bones allows you to build more muscle mass. So you have shorter, stockier guys who can build more muscle more easily than taller, skinnier guys. Then factor in that these naturally skinny guys need to expend more energy to move their longer limbs, but because they aren’t as wide, they also have proportionally smaller stomachs.
We already have 2 archetypes that require totally different approaches to exercise and nutrition, and we haven’t even covered half of the reasons why.