Some people have exercise-induced Asthma, which is asthma that happens when you are exercising. Asthma is when you start nwheezing and coughing, and you can't breathe. Most people who have asthma will get an asthma pump, a tool used to help you breathe better. If you exercise vigorously, you may run out of breath, and asthmatic people have the tendency to start wheezing and have an asthma attack.