Key Takeaway
Expert consensus defines Zone 2 as just below LT1/VT1, with blood lactate ~1-2 mmol/L and HR at 70-80% max.
Summary
This 2025 expert consensus paper provides standardized definitions for Zone 2 training:
- Intensity: Just below LT1/VT1
- Blood lactate: ~1-2 mmol/L
- Heart rate: 70-80% of max
- RPE: ~10 on 6-20 Borg scale