Fat People Face Problem in Mountain Climbing

It's easy to understand: thin people only carry the weight of their backpack. 

In this case, the lungs and the heart function to maintain breathing and blood circulation in the body, and the muscles work only to generate the small amount of energy needed to carry the weight of the backpack.

On the other hand, in the case of an overweight person, these two organs have to work many times as hard because the person needs additional energy to carry the weight of their own body, as well as the weight of the backpack.

In summary, any organ or system that works more than normal tends to get tired more quickly.

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Detailed Explanation:

Heart and Lung Effort:

   - Thin People: In thin individuals, the lungs and heart need to work to oxygenate and pump blood to a smaller amount of body tissue. 

This effort is less because there is less body mass to maintain.

   - Overweight People: In overweight individuals, the lungs and heart have to work more intensively. 

This is because there is more tissue to oxygenate and more weight to move, thereby increasing the demand for energy and cardiovascular effort.

Additional Load:

   - Backpack: When a person carries a backpack, it adds an extra load. 

For a thin person, this may not represent a significant effort because their body is already accustomed to handling a smaller load.

   - Overweight and Backpack: An overweight person not only has to handle their additional body weight but also the extra weight of the backpack. 

This means the heart and lungs have to work even harder to meet the body's energy and oxygenation needs.

Fatigue:

   - Increased Effort: Any organ or system that is forced to work beyond its normal capacity fatigues more quickly. 

In the case of the heart and lungs, working harder to move and oxygenate a heavier body results in greater fatigue.

   - Energy and Recovery: The additional energy required to maintain a larger body mass means that overweight people tend to tire more quickly during physical activities compared to thin people performing the same activities.

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In resume, the lungs and heart of an overweight person need to work more intensively to meet the body's needs, leading to greater fatigue compared to a thin person performing the same activity. 

This principle is based on the basic physiology of cardiovascular and respiratory effort.

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