Turn your Oura Ring data into a report your doctor can use.
Try it freeInspired by Bella Anya Kraft (@bellaanya) — an online fitness coach from Wisconsin (308K followers) who uses Oura Ring data daily with her clients. Her viral TikTok (495K+ views) walks through the three metrics she checks every morning, complete with real numbers from her own ring. This article expands on her insights with additional scientific context.
You've got the ring on your finger. The app is installed. And now you're staring at a dashboard full of numbers, graphs, and color-coded bars wondering: what does any of this actually mean for me?
You're not alone. The Oura Ring tracks a staggering amount of biometric data — heart rate, body temperature, blood oxygen, movement, sleep stages — and presents it across multiple screens. For a new user, the sheer volume can feel more overwhelming than helpful.
Bella Anya Kraft, a fitness professional who regularly has her clients share their Oura Ring screenshots as part of their coaching, has a refreshingly simple approach: focus on three metrics. Every day. That's it.
Those three metrics are heart rate variability (HRV), deep sleep duration, and your Readiness Score. Together, they give you a surprisingly complete picture of how your body is recovering, adapting, and preparing for what's next.
Let's break down each one — what it measures, what the science says, and how to actually use it.
Heart rate variability is the variation in time between consecutive heartbeats. If your heart beats 60 times per minute, those beats aren't perfectly spaced one second apart — there are tiny fluctuations, sometimes 0.9 seconds between beats, sometimes 1.1 seconds. HRV captures that variation.
This might sound like a flaw, but it's actually a feature. Those fluctuations are controlled by your autonomic nervous system (ANS) — the branch of your nervous system that handles things you don't consciously control, like digestion, heart rate, and the fight-or-flight response.
Your ANS has two sides:
When both systems are functioning well and your body is recovered, there's a healthy push-and-pull between them, which creates more variability between heartbeats. When you're stressed, sick, sleep-deprived, or overtrained, the sympathetic side tends to dominate, and that variability drops.
As Bella puts it simply: HRV reflects "your body's ability to respond to stress." Higher generally means more resilient. Lower generally means your system is under load.
This isn't just fitness-influencer wisdom. A substantial body of research supports HRV as a reliable marker of autonomic nervous system function. Studies published in journals like Frontiers in Public Health and the European Heart Journal have consistently linked higher resting HRV with better cardiovascular health, improved stress resilience, and more effective recovery from physical exertion.
Bella emphasizes a point that's crucial and often overlooked: HRV is deeply individual. Your baseline number depends on your age, sex, fitness level, genetics, and a dozen other factors. A 25-year-old endurance athlete might have a resting HRV of 80+. A healthy 55-year-old might sit around 25–35 and be doing perfectly fine.
Research confirms this. Population-level HRV norms vary so widely that comparing your number to a friend's — or to an influencer's — is essentially meaningless. What matters is your trend over time.
Bella's approach is practical: she looks at her HRV across the week and identifies her personal range. From her own data, she knows that readings in the 45–65 range signal a good day. Readings in the single digits or teens tell her something is off — she's been sick, under-recovered, or made choices (like a late night out) that her body is still processing.
Here's how to build your own baseline:
The Oura Ring measures HRV during sleep (specifically during your most restful periods), which research suggests provides a more stable and reliable reading than daytime spot-checks.
Sleep isn't one thing. Throughout the night, your body cycles through several stages: light sleep (N1 and N2), deep sleep (N3, also called slow-wave sleep), and REM sleep. Each serves different functions, but deep sleep is where the heavy-duty physical repair work happens.
During deep sleep:
This is why Bella pays such close attention to deep sleep with her fitness clients. If you're training hard but not getting adequate deep sleep, you're essentially shortchanging the recovery process that makes training productive in the first place.
This is where things get nuanced. Sleep research generally suggests that adults need roughly 1 to 2 hours of deep sleep per night, though this varies by age (deep sleep naturally decreases as you get older) and individual physiology.
Bella shares that she personally aims for at least 1.5 hours, ideally closer to 1 hour and 50 minutes to 2 hours, from a total of about 8 hours of sleep. From her work with female clients, she's observed that dipping below an hour of deep sleep tends to correlate with noticeable effects: slower recovery, increased fatigue, more cravings (especially for sugar), and a general feeling of being off-balance.
Her observations align with what we know about the relationship between sleep deprivation and appetite hormones. Research has shown that insufficient sleep — and particularly insufficient deep sleep — is associated with increased ghrelin (the hunger hormone) and decreased leptin (the satiety hormone), which can drive cravings and overeating. A landmark study in the Annals of Internal Medicine found that sleep restriction significantly altered the body's metabolic response to food.
The Oura app shows your sleep stages as colored bars in the Sleep tab. Here's what to look for:
Oura's Readiness Score is a composite metric — it pulls together multiple data points from the previous night and recent days to generate a single number out of 100. According to Oura, the score factors in:
The result is a single number that attempts to answer a simple question: how ready is your body today?
Bella uses it as a training decision tool, and her thresholds are straightforward:
The idea of combining multiple physiological signals into a readiness or recovery metric isn't unique to Oura — it's a concept that has roots in sports science. Professional athletic programs have long used combinations of HRV, resting heart rate, subjective wellness questionnaires, and training load data to make decisions about athlete readiness.
A 2019 review in Sports Medicine found that HRV-guided training — where athletes adjusted their training intensity based on daily HRV readings — produced equal or better outcomes compared to rigidly following a pre-planned program. The key insight: listening to your body's signals (with data to back them up) helps prevent the overtraining that derails progress.
Oura's Readiness Score essentially automates a version of this process for everyday users. It's not perfect — no algorithm can fully capture how you feel — but it provides a useful starting point.
A few practical tips:
Based on Bella's approach, here's a simple morning routine for reading your Oura Ring data:
The entire process takes about 30 seconds. Over time, you'll start to internalize your patterns and won't even need to think about it — you'll glance at the dashboard and immediately know where you stand.
Your Oura Ring generates rich data every night — but seeing the full picture across weeks and months can be hard in the app alone.
Simple Wearable Report connects to your Oura Ring and generates free, lab-style health reports that surface your HRV trends, sleep patterns, and recovery data in a clean, shareable format. It's designed to be something you can actually bring to a doctor's appointment, share with a trainer like Bella, or just use to understand your own trends more clearly.
Free, GDPR-compliant, and takes about two minutes to set up.
See your trends → simplewearablereport.com
Watch Bella's full Oura Ring data guide: https://www.tiktok.com/@bellaanya/video/7592037417293597965
Your Oura Ring collects thousands of data points every night. Simple Wearable Report turns them into a personalized weekly briefing — what changed, what it means, and what to watch. It takes 2 minutes to connect and it's free.
Free tools that turn your Oura Ring data into something you can share and act on.