The right cardio prescription depends on whether time or fatigue is capping your training volume, not on a fixed ratio of zones.

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• Everyone should do resistance training plus cardio each week, with at least one high-intensity interval session and some long, slow zone 2 work. AHAndrew Huberman6 Jan 2025
• Training equals workout plus rest, and overtraining can result when reduced rest is not matched by reduced workout time or intensity. PMPhil Maffetone10 Nov 2020
• Resistance training should be the bedrock alongside true high-intensity work; long easy zone 2 sessions suit mental health but are not optimal for body composition and metabolic health. SSStacy Sims22 Jul 2024
• Zone 2 training is a way of accumulating aerobic volume cheaply, not a physiological lever with magic of its own. PAPeter Attia29 Aug 2026
• Blending strength and conditioning may give a more well-rounded result than keeping them apart. JCJeff Cavaliere4 Jul 2022

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