But it is said ( and I believe it) that most people gravitate towards zone3 because it is "comfortable)" and do most of their running there . Most running should be in zone2 ( easy conversational pace) but people don't because it is too slow and is actually quite hard on legs. Some running should be in Zones 4&5 ( tempo running in zone 4 and fasthill/intervals in zone 5) but most people don't because those zones hurt too much!!
It is said than most people run too hard on their easy days and run too easy on their hard days Ultra-runners ( like you) should spend most of your time in Zones 1&2
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