Trying to constantly adjust my speed to obtain a target heart rate is something that would drive me crazy. Although occasional checking can be beneficial, and understanding how your HR responds to a Long Slow Run, a tempo run and speed work can help your training.
HRM's have their benefits, but I wouldn't want to let it drive my decision-making.
Also, I try to keep my wits about me when I run - checking for traffic, uneven surfaces on the sidewalk, etc. Concentrating on trying to read an HRM would be take away a lot of the awareness of my running environment.
Also, HR target ranges are based on broad population averages, and like most averages, they are a good guide for about 1/3 of the population, somewhat useful for another 1/3, and less useful for the remaining 1/3. It is possible that HR driven training could leave you shortchanging yourself, even if you are in the 'target zone'.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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