Your heart rate is a telling metric, providing insight into how hard your heart has to work both while resting and during exercise. (tomsguide.com)
In our sessions, we did many things, the biggest being digging into my rock hard heart. (frontrangecounselingcenter.com)
Knowing your heart rate is important not only for monitoring the intensity of your workout, but also for telling you how hard your heart has to work while you're resting. (tomsguide.com)