I Couldn’t Stay in Zone 2 on My Easy Runs. Then I Took a VO2 Max Test That Finally Explained Why. - Runner's World

I Couldn’t Stay in Zone 2 on My Easy Runs. Then I Took a VO2 Max Test That Finally Explained Why. - Runner's World
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Although the treadmill is only moving at 4.4 miles per hour, I feel like I cannot possibly go on. The grade just rose to 16.3, and my legs, though barely shuffling, are moving with great difficulty. … [+6825 chars]

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