It's know fact that atheletes has less basal heart rate., Which is body compensation mechanism., Unless is having complaining of chest pain , palpitations , breathing difficulty .. u don't have to worry about that. It's also advisable to monitor every year - 2 years  to rule out 1)ECG 24 hrs - HOLTER to see if ur having electrical disturbances in heart.. which is also common in atheletes 2) ECHO to role out HOCM which is constriction of heart outflows - HOCM is one the most common cause of sudden cardiac death in atheletes Be safe follow regular check up