Exercise. Exercise is a common asthma trigger. But your child should not limit their participation in sports or other forms of exercise unless directed by their healthcare provider. Exercise is good for your child's overall health and lungs. Some forms of exercise, such as running long distances, may be harder for your child. Always make sure your child has a warm-up and cool-down period before and after exercise. Using a reliever medicine 15 to 20 minutes before starting exercise can be very helpful, as directed by your child's provider. Talk with your child's provider about exercise if this is a problem for your child.