I have begun a swimming exercise class at our local YMCA. I take a deep water class in the cool pool and I do A-chi in the warm water pool twice a week. My question is - I don't have any problem breathing in either pool but I've met some people who can NOT breathe in the warm pool because of their COPD.....am I doing harm to my lungs in the warm pool, even though I don't have any issues in the warm pool?? Clowning Granny