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
of the chest will be helpful in detecting the pathological cause for the symptoms.
Wishing you a good health.