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Day 25Zone-2 base — bike or jog

Week 4 · Thu · Zone-2 Base · ~30 min · 60–70% HRmax · nasal-breathing if possible

A second weekly Z2 stamps the mitochondrial signal in. Skip if you are sore — recovery is non-negotiable. Week 4 — taper. Cut 25% volume, hold intensity, prep for re-test. Volume cut 25% this week — let the engine consolidate.
Coach

Today's exercises

Not medical adviceVO2max protocols can be intense. Consult your doctor before starting any exercise plan, especially if you have a pre-existing condition. Stop immediately if you feel chest pain, dizziness, or unusual shortness of breath.