My lungs feel heavy. I am a 40 year old, 6'1 230 lb active person. I am trying to loose weight as I know I am overweight. Over the past two months I have been working out daily, whether weight lifting for an hour or running on the treadmill. I am up to running seven miles on the treadmill several times a week at just below a ten minute mile pace. My recovery period after the run is very short and within 3 or 4 minutes my heartrate is back to normal, or just slightly above normal. My Garmin heartrate monitor has my resting heartrate at 65. On Saturday, I rode in the STP ride, Seattle to Portland 204 mile bike ride. It took me 13.6 hours of riding. I felt out of shape and my legs cramped up several times. But over the next two days I wasn't overly sore. However, when I ran on Wednesday my lungs felt tight and heavy. Last night when I lifted for an hour, I felt the same. As I sit here typing, I still feel the same. I understand that my weight is playing a role, but something else is causing this. I don't have a cough or temperature - could this be walking pheumonia?