You glance at your heart rate monitor during a tough run and an unusually high number jumps out at you. Should you be excited or concerned?
Aerobic exercise is any sustained rhythmic movement that uses major muscle groups and puts constant demand on your heart ? running, walking, swimming, cycling, dancing.
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What are training and HR zones?

Heart rate training is a progression from running by feel or running by pace, as both methods can be inherently inaccurate.
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