I think about my heart a lot.  I am constantly monitoring my resting heart rate, my training heart rate, my HRV, how my heart feels when I am going all out, and I think hard about how to make my heart work better today and tomorrow and long into the future.  I thought it was time to talk to the one and only Benjamin Levine, MD, a practicing cardiologist and researcher with an amazing track record in Sports cardiology and cardiovascular physiology and exercise.