There are a few key differences between exercise and illness that help to explain why one can lead to increased strength while the other does not.
When we exercise, we cause controlled damage to our muscles. This damage is then repaired by our body, making the muscles stronger in the process. However, when we get sick, our bodies are fighting an uncontrolled invasion of foreign agents (viruses, bacteria, etc.), which can often result in widespread damage. While our bodies do repair this damage eventually, it is not typically targeted at specific muscle groups like it is with exercise-related injuries.
Additionally, extroverts may be more likely to take care of themselves and have healthier lifestyles overall, which could help them fend off illnesses more effectively. They may also have larger social networks that provide support and assistance during times of need – both of which can lead to better health outcomes.
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