A reporter writes about personal physical effects after traveling to Mexico City and running a 5k shortly after arriving. The article frames the experience in the context of an international football tie in which teams must play at Mexico City’s high altitude. The writer describes sensations that occur soon after landing and during/after the run, emphasizing immediate bodily responses rather than competition outcomes. The account is presented as a first-person test of how altitude and rapid adjustment may feel to someone exercising soon after arrival. The article’s headline highlights chest tightness and the need for protective treatment for the skin, indicating discomfort and irritation experienced during the effort. While the piece does not provide clinical measurements in the provided excerpt, it connects the author’s experience to the broader question of how athletes may cope with Mexico City’s conditions, including altitude-related strain. Overall, the sources agree on the core premise: a short time after touchdown in Mexico City, the reporter runs a 5k and reports immediate effects on the body.