Hi welcome to Health care magic forum. I congractulate you for doing exercises at the age of 50+, any how the problem you have expressed appears to be the ronchi fromyour lungs due to some infection in the chest. After the exercise as the respiration rate
is increased ronchi become appearent.
I advise you to consult a physician for lung infection
, you may need to have an x ray
for confermation of the disease. At the age of 50+ one will have muscle twitchings after exercise that might be reason for pain in the chest or infection it self also can cause pain.
It is quite advisible to have examination for maintenance of the present good health.
Dont worry you will be fine with the minimal treatment. i thank you very much for calling.