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btw, current guidelines according to all the fitness agencies I've worked with/studied are for cardio "30-60 minutes most days."
That's for basic health, what experts say EVERYONE should be doing just to reduce risk of heart attack & cancer.
For weight loss, the recommendation is 60 minutes per day.
Our bodies were really designed to be active MUCH more than that, more like 6-8 hours a day of vigorous hunting/gathering.
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