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How intensive rock climbing in terms of cardio load?

It seems that cardio health was the biggest contributor to not getting serious Covid, seems surprising that an athlete would get this.

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Very intensive with cardio. A big wall climb is probably 2-3k vertical feet or more of climbing. That's like climbing hundreds and hundreds of floors in a building (but even steeper and harder). Speed climbers can ascend something that high in a matter of hours. It's a big cardio and endurance demand.

He developed ME/CFS in 2018 without a known cause (to the best of my knowledge).

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