🧬 What's Your Body Type?
Find out if you're an ectomorph, mesomorph, or endomorph
Written by Albert Mateos · Founder & Editor
Last reviewed: May 2, 2026
What this quiz measures
The body-type quiz estimates your dominant somatotype tendency along three axes: ectomorph (linear build, narrow shoulders and hips, tendency toward leanness and difficulty gaining mass), mesomorph (broader shoulders, muscular frame, responsive to training stimulus), and endomorph (wider waist and hip girth, higher fat-mass propensity, slower energy-expenditure response). The classification originates with William Sheldon's 1940 work The Varieties of Human Physique, but the version used in modern sports science is the Heath–Carter anthropometric somatotype (Carter and Heath, 1990), which replaced Sheldon's photographic method with measurable inputs: skinfolds, bone breadths, limb girths, and height-weight ratios.
How to interpret your result
You will almost certainly land as a blend rather than a pure type — a "balanced mesomorph," "endo-mesomorph," or "ecto-mesomorph" is far more common than a textbook extreme. Read the result as a tendency, not a destiny. Somatotype influences how quickly you accumulate muscle versus fat at a given calorie surplus and how your frame distributes mass, but it does not cap what you can become. Olympic lifters, sprinters, and bodybuilders across every weight class come from every somatotype band. Use the result to set realistic short-term expectations (an ectomorph may need a slightly larger surplus to gain weight; an endomorph may benefit from tighter macro tracking) and then ignore it whenever it tries to discourage you.
Question 1 of 6
What best describes your natural build?
About this quiz
Find out if you're an ectomorph, mesomorph, or endomorph with our free body type quiz. Answer questions about your bone structure, metabolism, and how your body responds to training and diet to get personalized nutrition and workout recommendations for your somatotype.
After your quiz: next steps
The most useful follow-up is to translate the qualitative label into quantitative targets. Run your numbers through our TDEE calculator and adjust the surplus or deficit based on your tendency: ectomorphs often tolerate a 250–400 kcal surplus without meaningful fat gain; endomorphs typically respond better to a smaller 150–250 kcal surplus or a body-recomposition approach. Pair that with our macro calculator and our protein calculator; protein needs (1.6–2.2 g/kg for hypertrophy) do not change with somatotype, but carbohydrate tolerance and meal timing often do. If your goal is muscle gain or fat loss specifically, the body recomposition calculator and body-fat calculator give you concrete numbers to track every 4–6 weeks.
Where this quiz comes from
Sheldon's original 1940 somatotype theory was explicitly tied to a now-discredited correlation between body type and personality (the "constitutional psychology" that modern science rejects). What survived peer review is the descriptive anatomical part: three axes that capture meaningful variation in human physique. Carter and Heath's 1990 monograph Somatotyping: Development and Applications provided the modern measurable framework still used by anthropometrists and Olympic-level performance teams.
Be honest about the limits. Somatotype is a simplification: most humans are blends, the categories are continuous rather than discrete, and the science has essentially zero predictive value for athletic outcomes once training history is controlled for. Genetic studies on muscle-fiber composition, ACE/ACTN3 polymorphisms, and training response (Bouchard, HERITAGE) have largely superseded somatotyping for predicting trainability. A self-report quiz cannot capture the actual Heath–Carter measurements (skinfolds and bone breadths require calipers and an experienced assessor), so treat the result as a directional hint, not a diagnosis. The quiz also cannot account for current training age, hormonal status, age-related changes, or medical conditions that affect body composition. If you want a precise picture, a DEXA scan and a coach who can take real anthropometric measurements will outperform any questionnaire.
Frequently Asked Questions
- What are the three main body types?
- The three somatotypes are ectomorph (naturally lean, narrow frame, fast metabolism), mesomorph (naturally muscular, medium frame, gains muscle easily), and endomorph (wider frame, stores fat more readily, strong lower body). Most people are a blend of two types rather than purely one.
- Does my body type determine my results?
- No. While body type influences your natural tendencies, it does not limit your potential. Ectomorphs can build significant muscle, and endomorphs can achieve lean physiques. Training and nutrition adjustments based on your type can help you work with your genetics rather than against them.
- Can my body type change?
- Your skeletal frame is largely fixed, but body composition is highly modifiable. Through consistent resistance training and proper nutrition, you can shift your appearance and performance significantly regardless of your starting type. Think of body type as a tendency, not a destiny.