Components of Fitness
What Are Components of Fitness?
Components of fitness are the different physical qualities that contribute to overall fitness. They are divided into two categories: health-related and skill-related components. AQA defines specific components you must learn, along with their definitions and fitness tests.
Health-Related Components of Fitness
These components relate to general health and wellbeing and are important for everyday life as well as sport.
| Component | Definition | Sporting Example |
|---|---|---|
| Cardiovascular endurance (aerobic endurance) | The ability of the heart and lungs to supply oxygen to the working muscles for sustained periods | Marathon running, cycling, swimming long distances |
| Muscular endurance | The ability of a muscle or muscle group to undergo repeated contractions without fatigue | Rowing, sit-ups, cycling uphill |
| Muscular strength | The maximum force a muscle can exert in a single contraction | Weightlifting, rugby scrum, shot put |
| Flexibility | The range of movement possible at a joint | Gymnastics, diving, hurdling |
| Body composition | The proportion of fat, muscle, bone, and other tissues in the body | Long-distance runners benefit from low body fat; sumo wrestlers benefit from high body mass |
Skill-Related Components of Fitness
These relate more to sporting performance and are typically improved through practice and sport-specific training.
| Component | Definition | Sporting Example |
|---|---|---|
| Agility | The ability to change direction quickly and with control | Dodging a tackle in rugby, returning a drop shot in badminton |
| Balance | The ability to maintain the centre of mass over the base of support (static or dynamic) | Handstand (static), surfing (dynamic) |
| Coordination | The ability to use two or more body parts together smoothly and efficiently | Dribbling a basketball (hands and eyes), racket sports |
| Power | The ability to combine strength and speed in an explosive action. Power = Strength × Speed | Long jump take-off, throwing a javelin, sprinting start |
| Reaction time | The time taken to respond to a stimulus | Sprinter reacting to the starting gun, goalkeeper saving a penalty |
| Speed | The maximum rate at which a person can move their body or a body part. Speed = Distance ÷ Time | 100m sprint, fast bowling in cricket |
Fitness Tests
You must know the appropriate fitness test for each component and how to carry it out.
| Component | Test | Protocol Summary | Unit |
|---|---|---|---|
| Cardiovascular endurance | Multi-stage fitness test (bleep test) | Run 20m shuttles in time with bleeps; speed increases each level until you cannot keep up | Level and shuttle |
| Muscular endurance | Sit-up bleep test | Perform sit-ups in time with bleeps; continue until you cannot keep up or reach the target | Number of sit-ups |
| Muscular strength | Hand-grip dynamometer | Squeeze the dynamometer as hard as possible with one hand; record best of three attempts | kg |
| Flexibility | Sit and reach test | Sit with legs straight against a box; reach forward as far as possible; record the distance | cm |
| Body composition | Body mass index (BMI) or skinfold callipers | BMI = weight (kg) ÷ height² (m²); skinfold callipers measure subcutaneous fat at specific sites | kg/m² or mm |
| Agility | Illinois agility test | Sprint and weave through cones in a set pattern as fast as possible | Seconds |
| Balance | Stork stand test | Stand on one leg, hands on hips, other foot against the knee of the standing leg; time how long you can hold it | Seconds |
| Coordination | Wall toss test | Throw a ball against a wall with one hand, catch with the other; count successful catches in 30 seconds | Number of catches |
| Power | Vertical jump test (Sergeant jump) | Stand side-on to a wall, reach up and mark; jump as high as possible and mark again; measure the difference | cm |
| Reaction time | Ruler drop test | Partner drops a ruler; catch it as quickly as possible; measure where you caught it (lower = faster) | cm (converted to seconds) |
| Speed | 30m sprint test | Sprint 30m as fast as possible from a standing start; time recorded | Seconds |
Reliability, Validity, and Test Considerations
When conducting fitness tests, consider:
- Reliability — the test produces consistent results when repeated under the same conditions. Factors: same equipment, same time of day, same warm-up.
- Validity — the test actually measures what it claims to measure. For example, BMI has low validity for muscular athletes because it does not distinguish muscle mass from fat.
- Practicality — cost, time, equipment requirements, and the number of people needed.
Limitations of Fitness Tests
- BMI does not account for muscle mass (a rugby player could be classified as "overweight" despite low body fat).
- Bleep test depends on motivation — performers may give up before reaching their true maximum.
- Most tests only measure one component, so a full fitness profile requires multiple tests.
- Environmental conditions (temperature, surface, wind) can affect results.
Exam Tips
- You must be able to name, define, and give a sporting example for every component.
- Learn the correct fitness test for each component — a very common exam question.
- Be prepared to justify why a particular component is important for a named sport or position (e.g. "A goalkeeper needs good reaction time to respond to shots on goal").
- Know the difference between muscular strength (one maximal effort) and muscular endurance (repeated efforts over time) — these are frequently confused.
- Remember Power = Strength × Speed — this formula is often tested.