Body type can be estimated by external signs, wrist size, and the rib angle, but the classification is conditional and rarely determines nutrition or training on its own. The main body types are ectomorph, mesomorph, and endomorph, and mixed variants are common.
The somatotype theory appeared in the 1940s and was first linked to personality traits, but that part of the theory was disproved. A more scientific approach today is the Heath-Carter formula, which evaluates body type on a scale from 1 to 7, although many details remain individual.
The short version
- The main body types are ectomorph, mesomorph, and endomorph, and pure types are rare.
- Body type can be estimated indirectly by appearance, by wrapping fingers around the wrist, and by measuring the rib angle.
- Body type classification is conditional and does not give a clear basis for training principles for every person.
- Training plans depend more on current physical condition, movement experience, and individual energy needs than on body type alone.
- Somatotype has a strong genetic component, but external factors can still influence body composition.
What body types are there?
There are three main body types: ectomorph, mesomorph, and endomorph. Mixed variants also exist, because pure somatotypes are rare.
Endomorph usually describes a person of short or average height with wider hips and rounder forms. Endomorphs are considered more prone to weight gain than ectomorphs.
Ectomorph usually describes a person with an asthenic build. One key feature of the ectomorph type is tall height, but not every tall person is automatically an ectomorph, because a tall person can also be a lean mesomorph or endomorph.
Mesomorph is considered a more balanced type with an athletic, sturdy build and average height. Mesomorphs are described as gaining muscle mass easily while keeping a low fat percentage, with a narrow waist, shoulders wider than hips, and an even distribution of muscle and fat.
How can you determine your body type?
You can determine your body type by indirect signs and by comparing your appearance with the external classification. Body type can also be estimated by measuring the wrist.
To estimate body type by wrist size, wrap the thumb and index finger around the wrist slightly above the protruding bone. If the fingers meet, the result points to mesomorph; if the wrist is thin and the fingers overlap, the result points to ectomorph; if the fingers do not meet, the result points to endomorph.
Body type can also be estimated by measuring the rib angle. Stand in front of a mirror and place your palms on the ribs where they spread under the sternum area.
In an ectomorphic build, the angle between the palms is less than 90 degrees. A right angle suggests mesomorph, and an obtuse angle suggests endomorph.
Does body type matter for nutrition and training?
Body type may influence metabolic processes and may potentially affect the effectiveness of different kinds of training, but the evidence is limited. Some researchers also note that people with certain somatotypes may be more successful in some sports than in others.
Most studies on body type have small samples and average quality. Body type also has a large genetic component, but training level and other external factors can influence it.
Training plans are shaped mainly by two factors: a person's movement competence and starting physical condition, and a balanced diet based on individual needs. Previous experience with exercise, sports in childhood, and adolescent physical activity are important when building a strength training program.
Nutrition guidance does not need to depend on body type alone. According to WHO recommendations mentioned in the source, balanced eating with individual needs in mind is important, and general formulas for daily energy intake can be calculated from age, body weight, and activity level, with a 10-15% deficit used when the goal is weight reduction.
Can you change your body type?
Body type has a strong genetic determination, but external factors can influence it quite strongly. The source gives a rough example that even a mesomorph placed in a situation of hunger could shift toward an ectomorphic build, and returning to a different body type would take time and effort.
There is currently not enough clear evidence to divide recommendations strictly by somatotype. General principles of healthy eating and an individually selected training routine are presented as the main way to achieve the best result.
Body type does not remove personal responsibility for everyday habits. Low activity and a large amount of refined foods will not help a person reach a goal, regardless of whether that person identifies as an ectomorph, mesomorph, or endomorph.
A trusted specialist can help with a training plan and dietary adjustments. Following tailored recommendations from a coach or another qualified professional is presented as more useful than relying on somatotype labels.
Common questions
What is the easiest way to identify body type?
The easiest way to identify body type is to compare your appearance with the general descriptions of ectomorph, mesomorph, and endomorph. The source also describes two indirect methods: the wrist test and the rib angle test.
Are pure ectomorph, mesomorph, and endomorph types common?
Pure somatotypes are rare. Mixed body types are common, so the classification is only approximate.
Should nutrition and training be built around body type?
The source says body type alone is not the best basis for nutrition and training. Individual energy needs, current physical condition, movement experience, and a balanced diet are presented as more important.
Can body type change over time?
Body type has a strong genetic component, but external factors can affect it. The source says changes in circumstances and habits can influence body composition, even if clear rules for each somatotype are lacking.