Welcome to the HCM.
For a person of 37 years without any risk factor like hypertension
,diabetes ,a resting heart rate of 85 bpm is absolutely normal.Nothing more to worry about it.
But chest pain that he has after exercise,needs further evaluation by cardiologist.
Cardiologist may advise exercise stress test
(trade mill test),color doppler/2 DECHO and coronary angiography
to rule out coronary artery ischemia or volvular heart disease
though possibility is very less.
Continue healthy eating habits and exercise(after trade mill test).
Avoid alcohol and smoking.
Further queries are most welcome.
Wish you good health.