What are the components of physical fitness, and how are they measured validly and reliably?
Identify the health-related and skill-related components of fitness and select valid, reliable and specific tests to measure each.
The health-related and skill-related components of fitness, the tests used to measure each, and how validity, reliability and specificity determine which test to choose.
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What this dot point is asking
You must identify the components of fitness and select appropriate tests, justifying the choice by validity, reliability and specificity.
Health-related components
These underpin general health and the ability to sustain activity.
- Aerobic capacity (cardiorespiratory endurance): the ability to sustain whole-body exercise; measured by the multi-stage fitness test (beep test) or a VO2max test.
- Muscular strength: the maximum force a muscle can exert; measured by a one-repetition maximum (1RM) or grip dynamometer.
- Muscular endurance: the ability to repeat contractions; measured by a push-up or sit-up test to fatigue.
- Flexibility: the range of motion at a joint; measured by the sit-and-reach test.
- Body composition: the proportion of fat to lean mass; measured by skinfolds or bioelectrical impedance.
Skill-related components
These support sporting performance.
- Speed: the rate of movement; measured by a sprint test (for example 30 m).
- Power: force x velocity, explosive strength; measured by a vertical jump or standing broad jump.
- Agility: the ability to change direction quickly; measured by the Illinois agility test.
- Coordination: smoothly combining movements; measured by an alternate-hand wall-toss test.
- Balance: maintaining stability; measured by the stork stand test.
- Reaction time: the time from stimulus to response; measured by a ruler-drop test.
Choosing the right test
Selecting a test is not arbitrary. You match the test to the dominant component of the activity (specificity), use standardised protocols so results are reliable, and confirm the test actually measures the intended component (validity). A field test (the beep test) is practical for a whole team; a laboratory test (direct VO2max) is more valid and reliable but costly and less specific to the field.
Using test data
Test results give a baseline, identify strengths and weaknesses, allow goal setting, and let you monitor progress by re-testing under identical conditions. Comparing pre- and post-program scores is how a training program is evaluated, which directly feeds the Performance Improvement task.
Interpreting the data well means more than recording a number. A score is compared against normative tables for the athlete's age and sex, against the athlete's own baseline, or against the demands of their sport, and the gap reveals the priority for training. When re-testing, the change must be judged against measurement error and natural variation, so a small difference may not be meaningful. The most credible use of test data isolates a real change by holding every condition constant between tests, then links the result to a training decision, which is exactly the reasoning the Investigation and Performance Improvement task reward.
Exam-style practice questions
Practice questions written in the style of SACE Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SACE 20226 marksSelect appropriate fitness tests for a chosen sport and justify each choice using validity, reliability and specificity.Show worked answer →
A 6 mark task needs tests matched to the sport with each justified on all three criteria.
Identify demands. Name the dominant components of the sport, for example aerobic capacity, agility and power in netball.
Select tests. Match a test to each (beep test, Illinois agility, vertical jump).
Justify. For each, argue specificity (reflects the sport's demand), validity (measures the intended component) and reliability (standardised protocol).
Markers reward tests matched to genuine demands and justified on all three criteria, not a list of tests.
SACE 20234 marksExplain the difference between validity and reliability in fitness testing, using an example.Show worked answer →
A 4 mark explain task needs both terms defined and applied.
Define validity. Whether the test measures what it claims, for example the beep test measuring aerobic capacity.
Define reliability. Whether repeated testing gives consistent results under identical conditions.
Apply. Show that changing surface, footwear or instructions reduces reliability and makes pre and post comparison meaningless.
Markers reward the distinction tied to a concrete testing example rather than definitions alone.