Being out of breath when exercising is either due to something like asthma (dr would check peak flow) or heart failure, chest infections, or being unfit. None of these are affected by HRT. TBH If I put on 10 lbs I'd feel very unfit. I can feel the difference even with 3-4 lbs when I do my hill walking.
Really aunty? Not heated whatsoever. The link is about asthma. I mentioned asthma in my first reply, I thought your post was telling the OP that HRT (or too much / too little estrogen) was the cause of her breathlessness and you were trying to prove that with the link, which would be worrying for women on HRT if they thought it caused breathlessness.