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Hard interval workouts, sometimes called Zone 5 training, that push you close to your top aerobic effort. Commonly practiced to help raise VO2 max, a fitness measure studied for its strong link to longevity.

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VO2 Max Training discussions

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Community post · Nov 6, 2026

Can hard intervals improve fitness more than steady exercise?

Hard intervals may improve fitness more than steady exercise; one cycling study reported gains of up to 46% in six months. Bicycling’s article reviews ways to raise [VO2 Max]( /biomarkers/cardiovascular/vo2-max), a measure of how much oxyg

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