Why does my asthma act up when I exercise? Because people tend to breathe through their mouths when they exercise, they are inhaling colder and drier air. In exercise-induced asthma, the muscle bands around the airways are sensitive to these changes in temperature and humidity and react by contracting, which narrows the airway.
What exercises should asthmatics avoid? Running, jogging, or soccer can be too much for a person with asthma if they are not accustomed to exercising. It is best to avoid exercising in cold, dry environments. The types of exercise that involve cold weather, such as ice hockey, skiing, and other winter sports, are more likely to cause asthma flare-ups.