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Heart Rate Monitors: Don't Run Without One By: Dr Christopher Segler | Dec 23rd 2009 - The main goal of running involves increasing cardiovascular fitness while avoiding injury. Heart rate monitors can help any runner or triathlete train more effectivley in less time. This article explains how heart monitors work, how to choose a heart rate monitor, and how to train with one. Heart rate monitors are now considered esential equipment for marathon training and endurance sports. Tags:herat rate monitor, run, runner, running, training, marathon, triathlon, ironman, injury, cardiovascular