If you battle exercise-induced asthma, you know how tough it can be to get regular exercise. But you can manage asthma in different ways so you can be physically active. Exercise-induced asthma is often not diagnosed, especially in children. If you or your child has symptoms, such as shortness of breath when you begin exercising and trouble breathing that goes away 20 to 30 minutes after exercise, be sure to tell your doctor. Using asthma-controlling medicine before your workout may help reduce symptoms, especially in cold, dry weather.