It is harder to breathe when climbing up a high mountain due to the decrease in air pressure and the thinning of the air at higher altitudes. At higher elevations, there is less oxygen available in the air, making it more difficult for the body to take in an adequate amount of oxygen. This can lead to symptoms such as shortness of breath, rapid breathing, and fatigue. Additionally, the body has to work harder to adjust to the lower oxygen levels, causing an increased respiratory rate and heart rate. This can make breathing feel more difficult and taxing on the body when climbing up a high mountain.
