Hello dear, Increase in heart beat during exercise is a normal physiological mechanism due to sympathetic stimulation. The pain can be attributed to costochondritis, secondary to the inflammatory process. Symptomatic relief can be obtained with anti inflammatory preparations, application of analgesic+muscle relaxants. If symptoms still persist, kindly consult an Orthopedician for proper clinical examination. Investigation like X ray or MRI of the chest will be helpful in detecting the pathological cause for the symptoms. Wishing you a good health. Take care.