Specificity is the answer. You are targeting a certain muscle in your body to improve it for an upcoming sport or activity like running a marathon or entering a Mr.Olympian body-building competition.
Swimming where a lifeguard can see is a good example of a "smart" exercise choice in this context.
<h3>What is Exercise?</h3>
This is defined as the form of physical activities such as running, jogging etc which helps to keep the body fit and improve the general well being of individuals.
A smart exercise which involves swimming where a lifeguard an see helps to protect the individual and prevent him/her from the risk of accidents encountered during exercises, Such risks include injuries, drowning and in sever cases death which is why an instructor is usually ideal for individuals thereby making it the most appropriate choice in this scenario.
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Explanation:
In humans, the brain accounts for ~2% of the body weight, but it consumes ~20% of glucose-derived energy making it the main consumer of glucose (~5.6 mg glucose per 100 g human brain tissue per minute.
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