Training and nutrition get most of the attention, but they're only half the equation. The other half — recovery — is where your body actually adapts and gets stronger. Elite sport has understood this for years, which is why professional athletes track recovery every single morning. Here's what they're measuring, and what it can tell you.
Heart rate variability (HRV)
HRV measures the tiny variations in time between heartbeats. Counter-intuitively, more variability is usually better — it signals a nervous system that's relaxed and ready to adapt. A sustained drop in your HRV often shows up before you consciously feel run down, making it one of the earliest signals that you need to back off.
Resting heart rate
Simple, but revealing. A resting heart rate that's elevated by several beats above your personal baseline can indicate incomplete recovery, the early stages of illness, or accumulated stress. The key word is personal — what matters is the change from your own norm, not comparison to anyone else.
Sleep — quantity and quality
Sleep is when most recovery actually happens. It's not just hours in bed: the proportion of deep and REM sleep, how often you wake, and how consistent your timing is all shape how recovered you feel. Small, consistent improvements here often outperform any supplement.
| Signal | What a change can mean |
|---|---|
| HRV down | Under-recovery, stress, or oncoming illness |
| Resting HR up | Incomplete recovery or accumulated fatigue |
| Poor sleep quality | Reduced adaptation and next-day readiness |
The point isn't the gadget — it's the trend
A wearable is only useful if you act on what it shows. One bad night means little; a week-long slide in HRV alongside a rising resting heart rate is a clear signal to prioritise sleep, reduce training load, or manage stress before it turns into injury or illness.
Turn recovery data into a plan
Our testing and coaching combine wearable data with your blood work — so recovery isn't guesswork, it's built into your programme.
See testing optionsThis article is general information, not medical advice. Wearable data is a useful guide but not a diagnostic tool; persistent changes in heart rate or sleep should be discussed with a clinician.