Are people who are in better physical condition more prone to altitude sickness?

Generally speaking, altitude sickness refers to the reaction to high altitude, and there is no saying that physically healthier individuals are more prone to altitude sickness. Physical fitness has no direct correlation with altitude sickness. The detailed analysis is as follows:

The occurrence and severity of altitude sickness are related to various factors including individual constitution, cardiopulmonary function, tolerance to hypoxia, the method of ascending to high altitude, elevation level, and physical activity at high altitude regions, rather than solely determined by one's physical condition. If a physically fit person has a strong tolerance for hypoxia—for example, long-distance runners—they usually do not experience altitude sickness easily, or may only experience mild symptoms. However, if someone physically fit has a poor tolerance for hypoxia—such as some weightlifters—they may also experience altitude sickness easily. Additionally, some people are naturally more tolerant to hypoxia and are less likely to develop altitude sickness regardless of their physical condition.

Before traveling to high altitude regions, it is recommended to adequately prepare and undergo acclimatization training based on individual circumstances to reduce the risk of altitude sickness.