Zone 2 training is low-intensity, aerobic-base running — but the hardest part isn't the science, it's one simple question: how do you actually know when you're in Zone 2?

Most runners rely on the heart rate zones their watch hands them. The problem is those zones are built on an estimate of your max heart rate that can be off by 40 beats per minute, which throws the whole calculation off.

In this solo episode, Evan breaks down what Zone 2 actually does for your body, why your watch is probably getting your zones wrong, and the no-gadget “talk test” that's more reliable than the numbers on your wrist. He also shares what nine weeks of real Zone 2 training did to his pace — and the injury that taught him to build smarter, not just faster.

What you'll learn:

• What Zone 2 is doing inside your body (mitochondria, capillaries, and the aerobic base)

• Why “220 minus your age” makes your watch's zones unreliable

• The talk test: how to find Zone 2 with no watch at all

• How much Zone 2 you actually need at your weekly volume (and why 80/20 isn't a universal rule)

• Why your heart rate spikes on hills — and why that's fine

• How long Zone 2 takes to work, with real before-and-after pace numbers

• The cardiovascular-vs-structural trap that led to an Achilles injury — and how to avoid it

Evan isn't a doctor or a coach — just a runner who reads the research and shares what he finds. Nothing here is medical or training advice.

Studies referenced:

Storoschuk et al., “Much Ado About Zone 2,” Sports Medicine (2025): https://link.springer.com/article/10.1007/s40279-025-02261-y

Persinger & Foster et al., the talk test and ventilatory threshold, Medicine & Science in Sports & Exercise (2004): https://pubmed.ncbi.nlm.nih.gov/15354048/

Nes et al., max heart rate accuracy, The HUNT Fitness Study, Scandinavian Journal of Medicine & Science in Sports (2013): https://onlinelibrary.wiley.com/doi/10.1111/j.1600-0838.2012.01445.x

Mølmen et al., mitochondria and capillary growth, Sports Medicine (2025): https://pubmed.ncbi.nlm.nih.gov/39390310/

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Until Next Time: Just Keep Running