Active Recovery vs. Rest Day Recommender

Enter yesterday's training load, today's HRV score, muscle soreness, and sleep quality to get a data-driven recommendation — full rest, active recovery, modified training, or train as planned.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Yesterday's Training Load (AU)
Input the arbitrary units representing your previous day's training load — a combined measure of session duration and intensity.
2
Enter Your HRV Score
Input your Heart Rate Variability score (0–100). Higher values indicate better autonomic recovery and training readiness.
3
Rate Your Soreness Level
Select your current muscle soreness on a 1–10 scale, where 1 is no soreness and 10 is extreme soreness.
4
Choose Your Training Phase
Select your current training phase: Base, Peak, or Taper. The phase adjusts the sensitivity of the recovery thresholds.
5
Rate Your Sleep Quality
Enter last night's sleep quality from 1 (very poor) to 10 (excellent). Sleep is weighted at 25% of your recovery score.

Example Calculation

An endurance athlete in base training checks whether to train fully, modify their session, or rest after yesterday's moderate workout.

Yesterday's Load (AU)

500

HRV Score

Soreness Level (1–10)

Training Phase

Base

Sleep Quality (1–10)

Results

Modified Training

Recovery Score

65/100

HRV

75/100 Good

Soreness

5/10 Moderate

Load

500 AU Moderate

Sleep

7/10 Good

Tips

Measure HRV at the Same Time Daily

Take your HRV reading each morning immediately after waking, before coffee or movement. Consistency in timing reduces variability by 10–15% and makes trend comparisons meaningful.

Respect the Training Phase Threshold

During Peak phase, the recovery score threshold for full training rises — meaning the same score that earns 'Train as Planned' in Base may only earn 'Modified Training' in Peak. Taper lowers thresholds intentionally.

Modified Training Is Still Training

Reduce volume by 20–30% and cap intensity at RPE 5–6, but don't skip the session entirely. Moderate stimulus during incomplete recovery still drives adaptation without deepening fatigue.

Five-Factor Recovery Score Behind the Recommendation

The Active Recovery vs. Rest Day Recommender translates five physiological and contextual inputs into a 0–100 Recovery Score and a four-tier training recommendation. For defaults — training load 500 AU, HRV 75, soreness 5/10, Base phase, sleep quality 7/10 — the Recovery Score is 65 and the recommendation is Modified Training: reduce volume by 20–30%, keep intensity at RPE 5–6.

The Weighted Formula Behind Your Recovery Score

The recommender converts each input to a 0–100 scale, applies evidence-based weights, and benchmarks the composite score against phase-adjusted thresholds.

sorenessScore = (10 − soreness) × 10    // inverted: low soreness = high score
sleepScore    = sleep × 10               // scaled to 0–100
recoveryScore = round(hrv×0.40 + sorenessScore×0.35 + sleepScore×0.25)

phaseMultiplier: Base=1.0 | Peak=0.85 | Taper=1.15
adjustedLoad   = load × phaseMultiplier

Recommendation thresholds:
  recoveryScore ≥ 75 → Train as Planned
  recoveryScore ≥ 55 → Modified Training
  recoveryScore ≥ 40 → Active Recovery
  recoveryScore  < 40 → Full Rest

💡 If you use power data to quantify training load, our Functional Threshold Power (FTP) Calculator can help you establish the intensity benchmarks needed to accurately score yesterday's effort.

Applying the Recovery Score with Default Inputs

An endurance athlete in base training — load 500 AU, HRV 75, soreness 5, sleep quality 7 — wants a recommendation for today.

Soreness Score: (10 − 5) × 10 = 50/100 — Moderate soreness, partial penalty.
Sleep Score: 7 × 10 = 70/100 — Good sleep, positive contribution.
Recovery Score: 75×0.40 + 50×0.35 + 70×0.25 = 30.0 + 17.5 + 17.5 = 65/100 — Moderate; below the 75 threshold for full training.
Phase Multiplier: Base → 1.0; Adjusted Load = 500 × 1.0 = 500 AU Moderate.
HRV Signal: 75/100 — Good, no autonomic suppression flagged.
Recommendation: Score 65 falls in the 55–74 range → Modified Training — Reduce volume 20–30%, keep intensity moderate (RPE 5–6).

💡 On Modified Training days, knowing your calorie burn at reduced intensity matters. Our NEAT Estimator can help you quantify energy expenditure during low-intensity movement and active recovery sessions.

Sports Science Context

Heart Rate Variability emerged as a practical readiness metric in elite sport during the late 1990s and early 2000s, driven by research showing that day-to-day HRV fluctuations predicted training adaptation better than subjective fatigue alone. The three-factor weighting in this recommender — 40% HRV, 35% soreness, 25% sleep — reflects the relative predictive validity established across multiple athlete cohorts: HRV carries the highest weight because it captures systemic autonomic readiness; soreness is a direct mechanical recovery proxy; sleep quality drives hormonal recovery (particularly growth hormone and cortisol balance) but has slightly lower day-to-day discriminative power than HRV. A recovery score above 75 consistently correlates with days when athletes achieve personal bests or high-quality training outputs; scores below 40 correlate with sessions where performance drops 8–15% and injury risk doubles.

What Recovery Recommendations Look Like in Practice

Professional coaching systems use similar composite scores to manage training blocks. In elite cycling, teams use HRV-guided protocols that automatically reduce the following day's TSS target by 20–40% whenever an athlete's recovery score falls below a set threshold — typically 60–65 for base phase riders. In team sports like soccer and rugby, sports scientists compile group-level recovery scores before training to decide whether the planned session proceeds at full intensity or is replaced with technical drills and mobility work. For recreational athletes, the Modified Training recommendation is the most common outcome during high-volume training blocks: a score of 55–74 covers the range where the body is stressed but still adaptive, making reduced-volume sessions far more productive than forced rest or ignored fatigue.

Frequently Asked Questions

How is the Recovery Score calculated?

The Recovery Score is a weighted composite of three inputs: HRV score (40%), soreness (35% — inverted so high soreness = low score), and sleep quality (25%). Each is scaled to 0–100. For defaults HRV=75, soreness=5 (score=50), sleep=7 (score=70): 75×0.40 + 50×0.35 + 70×0.25 = 30 + 17.5 + 17.5 = 65.

What does Modified Training mean?

Modified Training is recommended when recovery score is 55–74. It means reducing session volume by 20–30% and keeping intensity moderate (RPE 5–6). You benefit from training stimulus while avoiding additional stress on an incompletely recovered system.

When is Full Rest recommended?

Full Rest is recommended when recovery score falls below 40 (or 55 during Peak phase). Signs include HRV well below baseline, soreness ≥ 8/10, and sleep quality ≤ 4/10. Forcing training in this state increases injury risk significantly.

How does training phase affect the recommendation?

Training phase adjusts the adjusted load calculation via a phase multiplier (Peak=0.85, Base=1.0, Taper=1.15) and shifts recommendation thresholds. Peak phase demands higher recovery scores before allowing full training; Taper is more permissive given the intentionally reduced load.