What Is Zone 2 Training, and How to Do It Right
Eat Move Think
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How Many Minutes Are You Working at Zone Four?
"It's a sliding scale. One of the things that happens is the athletes that the intervals get longer, the total workouts get tougher," he says. "And I say hill if you're a runner, just because for most people, that's a pretty decent way of activating the cardiovascular system without having to run real fast."
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