When the immune system attacks itself.
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.
Read more about Exercise here brainly.com/question/1365564
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High self esteem i believe it makes the most sense
