Aerobic Intensity Classification (Light / Moderate / Vigorous)
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ACSM's master table for translating "moderate" and "vigorous" into numbers across every common metric — %HRR/VO2R, %HRmax, RPE, and METs.
Detail
ACSM classifies aerobic intensity into light, moderate, and vigorous bands, defined across several metrics so any available tool can be used. The relative metrics (%HRR, %VO2R) and the absolute metric (METs) do not map perfectly onto each other, but the bands are:
| Intensity | %HRR or %VO2R | %HRmax | RPE (6–20) | RPE (CR10) | METs |
|---|---|---|---|---|---|
| Light | 30–39% | 57–63% | 9–11 | <5 | 2.0–2.9 |
| Moderate | 40–59% | 64–76% | 12–13 | 5–6 | 3.0–5.9 |
| Vigorous | 60–89% | 77–95% | 14–17 | 7–8 | ≥6.0 |
| Near-maximal / maximal | ≥90% | ≥96% | ≥18 | ≥9 | — |
Key thresholds to remember:
- Moderate intensity: 40–59% HRR/VO2R, 64–76% HRmax, RPE 12–13, 3.0–5.9 METs — "can talk but not sing" on the talk test (see talk-test).
- Vigorous intensity: ≥60% HRR/VO2R, ≥77% HRmax, RPE ≥14, ≥6.0 METs — "can't say more than a few words without a breath."
These bands are the numerical backbone of the weekly volume targets (150–300 min moderate or 75–150 min vigorous; see weekly-aerobic-volume), and they connect each intensity metric covered separately: %HRmax (percent-hrmax), %HRR (karvonen-hrr), VO2 reserve (vo2-reserve), RPE (rpe-borg-scales), and METs (mets).
Key facts
- Moderate: 40–59% HRR/VO2R · 64–76% HRmax · RPE 12–13 (6–20) / 5–6 (CR10) · 3.0–5.9 METs.
- Vigorous: ≥60% HRR/VO2R · ≥77% HRmax · RPE ≥14 (6–20) / 7–8 (CR10) · ≥6.0 METs.
- Light: 30–39% HRR/VO2R · 57–63% HRmax · <3.0 METs.
- Talk test: moderate = "talk not sing"; vigorous = "only a few words."
- Relative (%HRR/%VO2R) and absolute (METs) metrics don't align exactly.
Connections
- percent-hrmax, karvonen-hrr, vo2-reserve — the relative metrics.
- rpe-borg-scales — the perceived-exertion metric.
- mets — the absolute metric.
- talk-test — the simplest field gauge.
- weekly-aerobic-volume — uses these bands for the moderate/vigorous targets.
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.