Almost everyone with asthma will experience exercise-induced bronchospasm after a bout of strenuous exercise, especially if done outdoors in cold air. However, symptoms can be prevented in almost everyone with asthma except during exacerbations. Talk with your doctor and evaluate your asthma drugs to find the right combination of asthma treatments that allow you to breathe well and exercise.
Activities that involve short, intermittent periods of exertion, such as volleyball, gymnastics, baseball, and wrestling, are generally well-tolerated by people with asthma, especially when they are faithfully taking an asthma controller medication. Swimming is generally well-tolerated by people with asthma because the swimming pool environment has warm, moist air. Working with your doctor, find the exercise you can perform four to five times a week for at least 30 minutes without asthma symptoms.
For in-depth information, see WebMD's Exercise and Asthma.