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Thanks. Had read something similar recently which is what prompted me to see what people here thought.
Brun-
I think it got popular when 200kg lumps (looks in mirror) wanted to beat the bulge and started heading to gyms. Doing proper exercise was too hard so when someone said "oh, look you burn a higher % of fat if you just walk to 60% HRmax" they were all like woo hoo and all the fat burning zone books appeared.
hippy
https://www.self.com/story/the-myth-of-the-fat-burning-zone