Final answer:
The subject of this question is Health and it is asking about the specific demands an activity places on the nervous, muscular, and energy-production systems.
Step-by-step explanation:
The subject of this question is Health. It is asking about the specific requirements that an activity places on your body's nervous, muscular, and energy-production systems.
For example, if you are participating in a high-intensity exercise like weightlifting, it requires your muscles to produce a significant amount of force. It also puts stress on your nervous system as it needs to coordinate and control the muscle contractions. In terms of energy production, weightlifting relies heavily on the anaerobic system to provide the necessary energy for short bursts of intense activity.
So, the activity's specific demands on these systems are what the question is referring to.
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