Sharp pain between breast when I exercise it's brief and goes when I stop?

More information.. We would need more information in order to give you an accurate impression.How old are you,?Do you suffer of any illnesses?taking medication? For example. If you are young and healthy then it could be muscular issues and taking analgesics can help.However,it is important to check the heart especially if the pain happens upon exercise and improves during rest.See your doctor for check up and tests.