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November 3, 2026 · 4 min read

Garmin Training Readiness, Explained for Runners

Garmin Training Readiness blends sleep, recovery time, HRV status, load and stress into a 1 to 100 score. Here is how a runner should actually use it.

By HealthAI

Garmin Training Readiness is a 1 to 100 score that estimates how ready you are to train each day, built from your sleep, recovery time, HRV status, acute load, and recent sleep and stress history. For runners, it is most useful as a check on whether today is a good day for a hard session, read alongside how you feel and your recent training. It should shape when you put your hard work, not whether you train at all.

What goes into Garmin Training Readiness?

According to Garmin's own manuals, the score is calculated continuously and updated through the day from six factors:

  • Sleep score from last night.
  • Recovery time.
  • HRV status, based on your overnight heart rate variability.
  • Acute load, your recent training load.
  • Sleep history over the last three nights.
  • Stress history over the last three days.

Garmin groups the score into five levels:

  • Prime, 95 to 100
  • High, 75 to 94
  • Moderate, 50 to 74
  • Low, 25 to 49
  • Poor, 1 to 24

How does HRV status feed in?

HRV status is one of the six inputs, and it needs time to become meaningful. Garmin says your watch measures HRV while you sleep, shows a 7-day average after the first week, and compares that average with your personal baseline after about three weeks. A 7-day average inside your baseline reads as Balanced, slightly outside as Unbalanced, and well below as Low.

That design matches what research recommends. A review of HRV monitoring in elite endurance athletes argued that readings should be averaged over several days and judged against each athlete's own long-term pattern, because single readings are noisy. For more, read HRV for runners.

Why can a runner's score drop after good training?

Two of the six inputs, recovery time and acute load, respond directly to the training you just did. After a long run, a race or a hard interval day, your score is supposed to fall. That is the score working, not a sign that something is wrong.

This is where runners get into trouble. If you read every Low as a stop sign, you will skip the very days a training block needs. A low score the morning after a big session usually means "run easy today," which is what a good plan already says.

How should a runner use Training Readiness?

Here is a practical approach for a serious runner.

  1. Check it against the plan, not instead of it. If today is an easy day, the score barely matters. Run easy. The score matters on key days.
  2. On key days, ask why it is low. Is it acute load from yesterday? Short sleep? A stressful few days? Each points to a different fix.
  3. Use your legs as the tiebreaker. A systematic review found that how athletes feel tracks training load at least as well as common objective measures, and the two often disagree. If the score and your body disagree, run the warm-up and decide from there.
  4. Act on patterns. One Low morning is common. Several Low or Poor mornings during an easy week is a real signal that something needs to change.

What should you do at each level?

These are coaching judgments, not rules:

  • Prime or High: run the planned session as written. Do not add extra work because the number looks good.
  • Moderate: a normal training day for most runners in a block. Start hard sessions and judge them from the first rep, ideally finishing with a rep in reserve. See finishing hard workouts with a rep in reserve.
  • Low: if a key session is planned, consider moving it a day, shortening it, or keeping it with more held back. Easy runs can usually go ahead.
  • Poor: easy running or rest. If you also have signs of illness, skip intensity, and see a doctor if fatigue lasts.

Our full decision framework is in should you run a hard workout on a low recovery day.

What are the limits of the score?

  • It cannot see everything. Muscle soreness, a niggle, low fuel or how motivated you feel are not directly measured.
  • It depends on wearing the watch. Sleep and HRV inputs need overnight data.
  • It is built on Garmin's model, not your coach's plan. It does not know that tomorrow is your goal race or that this week is meant to be hard.

For the bigger picture, including sleep, resting heart rate and check-ins, read our pillar guide, training by recovery. If you also own a WHOOP, see how its approach differs in WHOOP Recovery for runners.

How your HealthAI coach applies this

HealthAI does not sync with Garmin yet, so your coach does not read your Training Readiness score automatically. You log runs in the health portal and check in on sleep, soreness and energy before key days, and you can add your readiness level to that note. Your coach weighs it with your recent training and how you feel, then keeps, shortens or moves the session and tells you why. Plans start at $30 a month, and you can see plans here.

Your coach builds this around your training data. Start at HealthAI.coach.

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