My grandchild had asthma almost from birth. After many horrible experiences and unhelpful suggestions from doctors, I desperately followed the suggestion of a naturopath and took her to Mexico. At the age of 5 she started swimming as much as 5 hours a day vigorously in the ocean. She never had asthmatic symptoms ever again altho continued to experience throat problems, such as tonsilitis. All her life her night breathing had been loud and uneven even when she was not having asthma. After beginning swimming her sleep breathing became normal. She is now 13 years old and has not had asthma once since age 5. I have since seen other studies about swimming for asthma sufferers. Sea water is best but pools seem to work. This treatment is most effective with children.