MY CHEST AND BACK FEELS STRAIN I DONT SMOKE ,I DO WORK OUTBUT NOT AS MUCH MY CHEST AND BACK AND MY NECK ,THE NECKSEEMS TO BE GETTING BETTER I CANT DO ANY JUMPING JACK BECAUSE IT BOTHER MY CHEST AREA IM A 51 YEAR OLD WOMENI STARTED WORKING  OUT ABOUT 30 SOMETHING YEARS AGO.  I THOUGT I WAS IN DECENT SHAPE
His think your pain may be died to aging process. It may be macular or due to arthritis. But for that you need detailed clinical examination and x-ray to be done for primary diagnosis. Get well soon.