Somatotypes

Somatotypes are a way of classifying body types based on shape and composition. For AQA GCSE PE, you must know the three somatotypes, their characteristics, and how they link to different sports and positions. Understanding somatotypes helps explain why certain body types are better suited to certain activities.

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What Is a Somatotype?

A somatotype is a classification of body type based on physical characteristics. The system was developed by the American psychologist William Sheldon in the 1940s and identifies three extreme body types. In reality, most people are a combination of all three, but tend towards one type.

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The Three Somatotypes

1. Endomorph

Feature	Detail
Body shape	Pear-shaped — wide hips, narrow shoulders
Build	Rounded, soft body with a tendency to store fat, especially around the waist and hips
Shoulders	Relatively narrow compared to hips
Limbs	Short arms and legs relative to the trunk
Fat storage	High tendency to store body fat; finds it harder to lose weight
Metabolism	Tends to have a slower metabolic rate

2. Mesomorph

Feature	Detail
Body shape	Muscular, athletic, wedge-shaped — broad shoulders, narrow hips
Build	Well-defined muscles, strong and powerful frame
Shoulders	Broad and wide
Limbs	Muscular arms and legs
Fat storage	Low body fat; gains muscle easily
Metabolism	Tends to have a higher metabolic rate; responds well to training

3. Ectomorph

Feature	Detail
Body shape	Tall, thin, lean — narrow shoulders, narrow hips
Build	Slim, delicate frame with little muscle or fat
Shoulders	Narrow
Limbs	Long arms and legs relative to the trunk
Fat storage	Very low body fat; finds it hard to gain weight (muscle or fat)
Metabolism	Tends to have a fast metabolic rate

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Somatotype Comparison Diagram

graph LR
    subgraph Endomorph
        A1[Wide hips]
        A2[Narrow shoulders]
        A3[Stores fat easily]
        A4[Pear-shaped]
    end
    subgraph Mesomorph
        B1[Broad shoulders]
        B2[Narrow hips]
        B3[Muscular build]
        B4[Wedge-shaped]
    end
    subgraph Ectomorph
        C1[Narrow shoulders]
        C2[Narrow hips]
        C3[Low body fat]
        C4[Tall and thin]
    end
    style Endomorph fill:#fff9c4,stroke:#f9a825
    style Mesomorph fill:#c8e6c9,stroke:#2e7d32
    style Ectomorph fill:#bbdefb,stroke:#1565c0

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Comparison Table

Feature	Endomorph	Mesomorph	Ectomorph
Shape	Pear-shaped	Wedge-shaped / athletic	Tall and thin
Shoulders	Narrow relative to hips	Broad	Narrow
Hips	Wide	Narrow	Narrow
Body fat	High tendency to store fat	Low body fat	Very low body fat
Muscle	Less defined muscle	Well-defined, muscular	Low muscle mass
Metabolism	Slower	Moderate to fast	Fast

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Linking Somatotypes to Sports

Different somatotypes are suited to different sports and positions. This is because the physical characteristics of each body type provide advantages in specific activities.

Endomorph Sports

Sport / Position	Why Endomorph Suits It
Rugby prop / front row	Large body mass provides stability in scrums and power in contact situations
Sumo wrestling	Greater body mass is an advantage for pushing and resisting opponents
Shot put / discus	Mass helps generate momentum for throwing
Weightlifting (heavyweight)	Large frame supports heavy lifting
Goalkeeper (some sports)	Larger frame covers more of the goal area

Mesomorph Sports

Sport / Position	Why Mesomorph Suits It
Sprinting (100m, 200m)	Muscular build provides power for explosive acceleration
Swimming	Broad shoulders generate powerful strokes; low body fat reduces drag
Gymnastics	Strength-to-weight ratio is excellent; muscular control aids complex movements
Rugby back / centre	Combination of speed, power and strength ideal for running and tackling
Boxing (middleweight)	Power, speed and endurance all served by mesomorphic build

Ectomorph Sports

Sport / Position	Why Ectomorph Suits It
Long-distance running	Low body mass means less weight to carry over long distances; efficient energy use
High jump	Long limbs provide a high centre of mass and lever advantage
Basketball (some positions)	Height is an advantage for shooting and rebounding
Cycling (road)	Light body weight is an advantage, especially on climbs
Volleyball	Height and reach provide an advantage at the net

Exam Tip: AQA commonly asks you to identify which somatotype would be best suited to a particular sport and explain why. Always link the specific characteristics of the somatotype to the demands of the sport. For example: "An ectomorph would be best suited to long-distance running because their low body mass means they carry less weight, reducing energy expenditure over the distance, and their long limbs create an efficient stride pattern."

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Important Notes About Somatotypes

Point	Detail
Most people are a combination	Very few people are a pure endomorph, mesomorph or ectomorph. Most are a mix.
Somatotype can change	Through training and diet, a person can shift their body type to some extent (e.g. an ectomorph can build muscle through strength training).
Genetics plays a major role	While training can modify somatotype, genetics largely determine the starting point.
Somatotype is not destiny	An endomorph can still be an excellent long-distance runner with the right training and dedication. Somatotype provides advantages but does not guarantee success.
Position within a sport matters	Within the same sport, different positions may suit different somatotypes (e.g. in rugby, props tend to be endomorphic, backs tend to be mesomorphic).

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Somatotypes and Body Composition

Somatotype is closely linked to body composition — the proportion of fat, muscle, bone and water in the body:

Somatotype	Typical Body Composition
Endomorph	Higher body fat percentage; moderate muscle mass
Mesomorph	Low body fat percentage; high muscle mass
Ectomorph	Very low body fat percentage; low muscle mass

Athletes in different sports aim for different body compositions, and understanding somatotypes helps explain why.

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Common Exam Mistakes