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Metrics explained
What each number in Everstride means, in plain words.
Coaches and athletes see the same numbers, worked out the same way. This page explains them all.
Recovery and readiness
Section titled “Recovery and readiness”Recovery
Section titled “Recovery”Your device’s own daily score from 0 to 100. It’s labelled with the name your device gives it, such as WHOOP recovery, Oura readiness or Suunto Balance.
- Good70 to 100Well recovered
- Moderate40 to 69Partly recovered
- LowUnder 40Still catching up
Each athlete has one main source for this score. Different companies calculate it differently, so Everstride never blends them, and scores from two companies aren’t directly comparable.
HRV (RMSSD)
Section titled “HRV (RMSSD)”Heart rate variability, measured overnight in milliseconds. It looks at the tiny changes in time between heartbeats. Compare it with your own usual on the same device. A clear drop can point to fatigue, stress or illness.
HRV SDNN
Section titled “HRV SDNN”A different way of measuring HRV, which some devices report instead. It can’t be compared with RMSSD values or with other athletes.
Resting heart rate
Section titled “Resting heart rate”Your heart rate at rest overnight. A rise of 5 bpm or more above usual is worth a check-in.
Skin temperature change
Section titled “Skin temperature change”Your overnight skin temperature compared with that same device’s baseline. A rise of 0.5 °C or more can point to illness.
What “usual” means
Section titled “What “usual” means”Your usual is the average of the 30 days before your most recent week, from the same device.
- Within usual range: the last 7 days sit inside your normal day-to-day swing.
- Well below or well above usual: the gap is larger than that swing.
- Low confidence: there are fewer than 14 nights from this device so far.
Everstride needs at least 3 recent readings and 10 older ones to make this comparison.
Sleep score
Section titled “Sleep score”Last night’s sleep from 0 to 100. Half comes from sleep efficiency, and half from how your sleep compares with an 8-hour target. A device’s own sleep score isn’t part of this, which is why the number can differ from your device’s app.
Sleep efficiency
Section titled “Sleep efficiency”The share of your time in bed that you actually spent asleep.
Training load
Section titled “Training load”Everstride measures training load from heart rate, so a session counts more when your heart works harder, and this works across sports. Because it’s based on heart rate, treat these numbers as a good guide, not an exact measure.
Training load (TRIMP)
Section titled “Training load (TRIMP)”Minutes of training, weighted by how hard your heart worked. 7-day load is the sum across the last 7 days. This isn’t the same as TSS, so numbers won’t match other tools.
Fitness (CTL)
Section titled “Fitness (CTL)”Your training load over the last 28 days, with recent days counting more. It moves slowly and shows the fitness you’ve built.
Fatigue (ATL)
Section titled “Fatigue (ATL)”Your training load over the last 7 days, with recent days counting more. It shows how tired your training should be making you now.
Form (TSB)
Section titled “Form (TSB)”Fitness minus fatigue.
| Form | Meaning |
|---|---|
| Below −30 | Overreaching risk if this lasts |
| −30 to −10 | Building, typical for hard weeks |
| −10 to +5 | Neutral |
| +5 to +25 | Fresh. Aim for +5 to +15 on race day |
| Above +25 | Very fresh |
Load ratio (ACWR)
Section titled “Load ratio (ACWR)”This week’s load compared with the last 4 weeks.
| Ratio | Meaning |
|---|---|
| Below 0.8 | Doing less than usual |
| 0.8 to 1.3 | The usual safe range |
| Above 1.5 | Higher injury risk |
Why a load number says “stale”
Section titled “Why a load number says “stale””If your device stops syncing, Everstride doesn’t assume you rested. Fitness and fatigue show their last known values, and form and load ratio are held back until syncing resumes.
Performance
Section titled “Performance”Functional threshold power, estimated as 95% of your best 20-minute power over the last 90 days.
Power curve
Section titled “Power curve”Your best power across durations from 5 seconds to 30 minutes. It uses rides only, so running and e-bike power don’t count.
Power divided by body weight, using your weight around the time of the ride.
VO₂ max
Section titled “VO₂ max”Your maximum oxygen use, from a lab test, in ml/kg/min. A watch estimate is shown separately and never mixed with lab values.
Benchmark levels
Section titled “Benchmark levels”- Pro level: what professional athletes reach.
- Top amateur: the best amateur racers, around national level.
- Amateur: below both.
Blood and lab results
Section titled “Blood and lab results”Blood results are compared with the range on your lab’s report: In lab range, Above lab range or Below lab range. A separate sports target may also appear, because a value can be medically normal and still short of what an athlete would aim for.