Zone 1: An area in which an explosive gas atmosphere is likely to occur in normal operation; Zone 2: An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
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Put simply, zone 2 training is aerobic exercise; the part where your heart rate is up, you're sweating but you're not tiring yourself out completely. Almost any moderate intensity cardio-oriented exercise, whether it's: Brisk walking. Jogging.
Zone 1 is considered the target range for warm-up and recovery work and should be about 50-60% of your heart rate (HR) max. Zone 2 is considered the target range for aerobic and base fitness work and should be about 60-70% of your HRmax.
That means zone 2 cardio can be running, brisk walking, cycling, swimming, rowing, skating, and elliptical training. Meet the expert: Melissa Kendter is an ACE-certified personal trainer, functional training specialist, and UESCA-certified run coach.