I graduated in April and have run outside 3 times a week since then. I usually run around the farm tracks.My warm up walk and the first 3 minutes of any run are on the one pavement we have in the village and the village green. I feel as if I can't get enough air into my lungs. AS soon as I pass the 5 minutes I have no problems until the end of the run. Any thoughts? I have used Vick and Olbas oil on my running shirt without any change. Thanks.