I had a lung test done by a personal trainer in my gym as I found myself really hard to breath when I get pushed hard....around the 168 to 175 bpm mark...and to be honest I always have done since I can remember. I just always thought nothing of it. The results show my FVC to be not great....averate is 5 litres of air I think I am in 3 litres something. I entered my results into a calculator I found and you can see them in the photo ive uploaded. I just want to know what these figures mean...I have a doctors appointment in a week but feel kind of anxious now so want to do my own research too.