I wrote recently about a review of medical studies that show a direct correlation between Cardiorespiratory Fitness (CRF) and mortality.
Bottom line: The healthier your heart is the longer you will live.
Well...this is a pretty good reason to know what your target heart rate is and how to monitor it. The good news is...it' s easy. Check out this very well written article I found on twitter, courtesy of Joe Gigantino entitled: