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I pity you foo wrote:

Yeah, these dudes both did 10,000m averaging 64 low, so I believe 63s for essentially the same thing with 2 minute breaks every 3 laps, even with some relatively minor altitude effects.

As for the other workout, I'd again say doable if for no other reason than the recovery is measured in distance and not time. They could have taken a minute to cover those 100 meters for all we know. If the recoveries were long, I'd say the altitude would be a non factor since you get help form the thinner air when you're running fast.

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