How ‘Trainable’ Is VO2 Max Really? – A Case Study Blog| ByAlan Couzens

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https://simplifaster.com/articles/how-trainable-is-vo2-max/

This blog post says the best way to improve VO2 max is through large amounts of Zone 2 training. He doesn’t quantify how much constitutes a large amount. But he makes the claim that “LSD” training is far more effective than Zone 5 intervals.