Which is the best definition of physical activity?

Question

BlackTom AI · Accepted Answer

Physical activity is any bodily movement produced by skeletal muscles that requires energy expenditure; this wording mirrors the World Health Organization’s definition and matches the correct answer.

1. Relevant knowledge points and concepts
- Physical activity: bodily movement produced by skeletal muscles that uses energy.
- Exercise: a subset of physical activity that is planned, structured, and repetitive with the goal of improving or maintaining fitness.
- Intensity and energy expenditure: physical activities vary from light to vigorous intensity based on how much energy they require.
- Sedentary behavior: low energy expenditure activities such as sitting or lying down.

2. Step-by-step reasoning process
- Compare each option to the standard definition used by public health authorities (e.g., WHO).
- Option stating movement by skeletal muscles requiring energy aligns exactly with that definition.
- Evaluate alternatives to see if they describe the full concept of physical activity or only a part or a mischaracterization.

3. Intermediate steps and checks
- Check option 1: “actions that use about 150 calories of energy per hour.” This assigns a specific calorie threshold that is arbitrary and not part of the standard definition; physical activity can require varying calories depending on person and activity.
- Check option 2: “any repetitive movement that causes gains in muscle mass.” This narrows activity to repetitive movements that increase muscle mass; many physical activities (walking, gardening) are not repetitive in that sense nor do they necessarily increase muscle mass.
- Check option 4: “exercise that significantly increases breathing and heart rates.” This describes moderate-to-vigorous intensity exercise, which is a subset of physical activity, not the whole definition.

4. Why the correct answer is correct
- “Movement carried out by the skeletal muscles that requires energy” is broad and inclusive, covering all forms and intensities of physical activity, and matches authoritative public health definitions.

5. Why other options are incorrect (brief)
- Option 1: Arbitrary calorie figure; inaccurate and not general.
- Option 2: Limits to repetitive, muscle-building movements; excludes many activities.
- Option 4: Describes only moderate-to-vigorous exercise, not all physical activity.

Conclusion: The best definition is “movement carried out by the skeletal muscles that requires energy,” which matches the provided correct answer.

Which is the best definition of physical activity?Single choice

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