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Fitness trackers have become one of the biggest trends in health and wellness.
Apple Watch, Whoop, Oura, Garmin, Fitbit, and dozens of other devices promise to measure everything about your body. Steps, calories, heart rate, HRV, sleep stages, recovery scores, strain, readiness, body battery, VO2 max estimates, stress levels, blood oxygen. The amount of data these devices can produce is overwhelming.
For some people, this data becomes genuinely useful. For others, it becomes a source of anxiety, obsession, or confusion. And for many, the sheer volume of numbers makes it hard to know what to actually pay attention to.
At Longma Fitness, we work with members who use every kind of tracker and some who use none at all. The question we get most often is a simple one. Which of these numbers actually matter, and which are mostly noise?
Here’s an honest breakdown of what’s worth your attention and what probably isn’t.
The Numbers That Actually Matter
A few metrics from fitness trackers have real value for most people. These are the ones worth paying attention to if your device measures them.
Resting Heart Rate
Your resting heart rate (the number of times your heart beats per minute while you’re at rest) is one of the simplest and most useful numbers a tracker can give you.
A healthy adult typically has a resting heart rate between 60 and 100 beats per minute. Trained athletes often have resting heart rates in the 40s or 50s. The specific number matters less than the trend over time.
As your cardiovascular fitness improves with consistent training, your resting heart rate should gradually decrease. This is one of the clearest objective measures that your fitness is improving. If your resting heart rate drops from 72 to 65 over six months of training, your heart has become more efficient. That’s real, measurable progress.
An elevated resting heart rate (10 or more beats higher than your normal baseline) can also indicate that something is off. You might be fighting an illness, underrecovered from training, dealing with high stress, or dehydrated. When your tracker shows an unusually high resting heart rate for a few days in a row, it’s worth paying attention.
Heart Rate Variability (HRV)
HRV measures the variation in time between individual heartbeats. Higher HRV generally indicates better recovery and a more balanced nervous system. Lower HRV often indicates stress, fatigue, or inadequate recovery.
HRV is more complicated than resting heart rate because the absolute number varies enormously between individuals. Your HRV can’t really be compared to someone else’s. What matters is your personal baseline and how your numbers trend relative to it.
If your HRV is consistently lower than your baseline for several days, your body is telling you something. Maybe you’re underrecovered from training. Maybe you’re not sleeping enough. Maybe stress is accumulating. Maybe you’re getting sick. The specific cause requires some reflection, but the signal is real.
The honest caveat about HRV is that measurement varies between devices, and even the best consumer devices aren’t perfectly accurate. Use HRV as a general trend indicator, not as gospel truth about your recovery status.
Sleep Duration and Consistency
Most trackers measure sleep, and the data on sleep duration is reasonably reliable even if the sleep stage breakdowns are often questionable.
What matters most is total time asleep and consistency of sleep timing. If your tracker shows you consistently getting less than seven hours of sleep, that’s useful information. If it shows your sleep timing varies wildly from night to night, that’s also useful information.
Don’t get too caught up in deep sleep versus REM sleep percentages reported by consumer devices. The accuracy of sleep staging on wrist-based trackers is still limited. But the broad picture of how long and how consistently you’re sleeping is genuinely useful.
Steps and Daily Movement
Step counts have been around for a long time and remain genuinely useful.
The specific target of 10,000 steps is somewhat arbitrary, but the general principle holds. Daily movement outside of structured training matters for your health. Someone who trains intensely four days a week but sits motionless the rest of the time is often less healthy than someone who trains three days a week and also walks regularly throughout the day.
If your tracker shows you’re averaging 3,000 steps a day, that’s worth addressing. If it shows you’re consistently hitting 8,000 to 12,000 steps, you’ve got a solid baseline of daily movement.
The Numbers That Mostly Don’t Matter
Several metrics that fitness trackers heavily promote are either inaccurate, misleading, or not actionable enough to be worth your attention.
Calorie Burn Estimates
The calories burned numbers on fitness trackers are notoriously inaccurate. Multiple research studies have shown that consumer devices routinely overestimate or underestimate calorie burn by 20% or more, especially during strength training or mixed-modal workouts.
If you’re using tracker calorie burn data to decide how much to eat, you’re probably getting it wrong. The error margin is too large to be useful for actual nutrition decisions. Pay attention to total food intake, protein, and your actual results over time rather than trying to balance calories burned against calories consumed based on tracker estimates.
Daily Recovery or Readiness Scores
Devices like Whoop and Oura produce daily scores that summarize your readiness to train. These scores can be useful as general indicators, but they can also become problematic.
Some people start treating these scores as prescriptions. Low readiness score means skip the workout. High readiness score means train hard. This approach misses the fact that your body often performs better than scores predict, and sometimes performs worse than they predict. The scores are summaries of underlying data, not accurate predictors of how a specific workout will go.
Use these scores as one input among several, including how you actually feel, how your warm-up goes, and what your training plan calls for. Don’t let a device override your own judgment.
VO2 Max Estimates from Wrist Devices
VO2 max is a real and meaningful measure of cardiovascular fitness, but the estimates provided by wrist-based consumer devices are rough approximations at best. They’re not accurate enough for serious athletes to use for programming, and they’re often misleading for everyday users.
If you’re curious about your actual VO2 max, lab testing is far more reliable. The wrist estimate is interesting but shouldn’t drive significant decisions.
Stress Scores
Several trackers now provide stress scores based on HRV and heart rate patterns. These can be mildly interesting but often tell you what you already know. If you had a stressful day at work, you probably don’t need a device to tell you that.
More importantly, these scores can create anxiety about stress itself, which is counterproductive. Pay attention to how you actually feel and what’s causing your stress rather than letting a device assign a number to your emotional state.
How to Use Trackers Well
If you’re going to use a fitness tracker, the best approach is to focus on a few metrics and ignore the rest.
Pick two or three numbers that genuinely matter to you (probably resting heart rate, sleep duration, and either HRV or steps) and track those over time. Watch the trends, not the daily fluctuations. Your resting heart rate on any single day doesn’t matter much. Your resting heart rate averaged over the last month compared to six months ago matters a lot.
Use the data to inform your decisions, not to make them for you. If your tracker says your recovery is low but you feel great and you’re excited to train, train. If your tracker says your recovery is high but you feel exhausted, maybe rest. Your subjective experience still matters.
Finally, consider that some people genuinely do better without a tracker. If the data causes you anxiety, makes you obsess over numbers, or disconnects you from your own body awareness, taking a break from the device might be the healthiest thing you can do.
How Longma Fitness Thinks About This
We coach members at every level of tracker use, from the ones who track everything to the ones who use nothing but a wristwatch.
The truth is that consistent training, adequate sleep, reasonable nutrition, and showing up over time produce results regardless of whether you’re tracking HRV or counting steps. The data can be useful at the margins. It can help you notice patterns you’d otherwise miss. But no amount of data replaces the fundamentals.
If you have a tracker and love it, great. Use the few metrics that actually matter. If you don’t have one or don’t want one, you’re not missing anything essential. The results come from the work, not the measurement.
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