Mariana Lenharo Totally true. My husband is a young heart attack survivor. His Apple Watch shows significant drop in heart rate from few months before HA to few months after HA. His cardiac rehab doctors suggested him exercises aimed at bringing down the heart rate further to achieve better heart health and fitness levels. Currently, beta blockers play an important role in keeping heart rate low. Over a period of time, I hope he can keep heart rate low by just exercising, proper diet and overall well being.