Your watch data,
explained.

Pace is the time taken to cover a kilometre or mile. For example, 5:30/km means 5 minutes 30 seconds per kilometre. Grade-adjusted pace estimates an equivalent effort on flat ground; the method varies by service.

Live pace is a short snapshot; average pace spreads the time over your whole recorded distance. Lap pace is often easier to use for an interval or a kilometre. Grade-adjusted pace models the effect of a slope, but it cannot fully allow for wind, mud, heat or your own hill-running ability.

Your watch estimates the length of your route using satellite data, sensors or calibration. A route can be recorded imperfectly around buildings, tree cover or tunnels.

Outdoor distance usually comes from satellite positions combined with device processing. Indoors it can depend on stride estimates or a calibrated foot sensor. A GPS route that cuts a corner or wanders around buildings changes both your distance and calculated pace. Two watches can disagree without either runner taking a different route.

Elevation is height above a reference level. Ascent and descent total the climbing and descending during your activity. Watches may use satellite, map or barometer data.

A barometric sensor uses air pressure to estimate height; GPS and map corrections use other methods. Total ascent adds the uphill parts and does not cancel them against the downhills. Small measurement errors can add up, particularly on a flat route or during changing pressure.

Elapsed time includes the whole activity from start to finish. Moving time may remove stops. Splits divide your activity into sections; laps can be automatic or manual.

Elapsed time runs from start to finish, including stops. Timer time usually excludes periods when you paused the recording; moving time is calculated by the service and may use a different rule. Auto-pause can make a session look quicker by excluding traffic lights or short rests.

Heart rate counts beats per minute. Average heart rate summarises an activity; the recorded maximum is its highest reading. A single wrist-sensor spike may be a measurement issue.

Heart rate counts beats per minute. Optical wrist sensors infer this from changes in reflected light; a chest strap uses a different signal. Your heart rate reflects the demands of a run, but also the conditions and your state that day. A rise at an unchanged pace has several possible explanations.

Zones divide heart-rate intensity into bands. Your device may base them on maximum heart rate, heart-rate reserve or lactate-threshold heart rate. The same zone number can mean different things under different settings.

Heart-rate zones are ranges used to describe exercise intensity. They may be calculated from maximum heart rate, heart-rate reserve, a threshold estimate or custom settings. The same heart rate can therefore receive a different zone label on two devices. Zone names are not universal.

This summarises heart rate during periods your device identifies as rest. Recording methods differ. Your own repeated measurements are more useful for comparison than someone else’s lowest number.

Resting heart rate is a measurement or estimate made while you are at rest. Some watches calculate a daily value from periods of low activity; others emphasise sleep. Trends are easier to interpret when timing and wear are consistent. Your normal pattern matters more than matching another runner.

This compares heart rate near the end of exercise with a later recovery reading. Some Garmin devices use two minutes; the measurement interval and recovery conditions matter.

Heart-rate recovery describes the drop after you stop an effort. The device compares your finishing rate with a later reading over its chosen interval. Walking, standing still, stopping abruptly and different exercise intensity all change the comparison. It is distinct from a countdown saying when to train again.

VO₂ max describes the maximum rate of oxygen use relative to body mass. A watch estimates it from available activity and personal data. It can move differently from a laboratory measurement or your race performance.

VO₂ max describes the maximum rate of oxygen use during intense exercise. A laboratory test measures gas exchange; your watch estimates a value using inputs such as speed, heart rate and your profile. Many devices report it relative to body mass. The estimate can shift before your real-world performance changes.

This estimates an intensity around which maintaining an effort becomes progressively more difficult. Devices can express it as a pace, heart rate or power; it is an estimate that depends on the available running data.

Lactate threshold describes a level of exercise intensity associated with changes in lactate accumulation. A watch estimates it from exercise and sensor patterns; it does not take a blood sample. The reported pace and heart rate are useful training references when the estimate fits your recent running.

A prediction models a possible race time using fitness and training data. Preparation for the distance, course, conditions, fuelling and pacing still matter.

A predicted race time is a modelled estimate, not a booking for a future result. Depending on the device it may use fitness estimates, training history and recent running. Endurance preparation, course, weather, pacing and fuelling still matter, especially as the distance gets longer.

A fitness-age feature converts selected fitness and lifestyle inputs into an age-like summary. Its ingredients and calculation depend on the manufacturer.

Fitness age translates a manufacturer’s selected fitness and lifestyle inputs into an age-style score. The calculation varies by device generation. It is a way of presenting a model, not your biological age and not a clinical assessment. Updated profile information can change it.

Exercise load describes one activity. Acute load summarises recent work; chronic load gives a longer-term view. A load ratio compares the two. Weighting and scales differ across brands and device generations.

Training load describes the stress represented by recorded sessions. Some systems estimate it from heart rate and post-exercise oxygen demand; others also use duration, effort or mechanical measures. Acute and longer-term load cover different windows. A watch cannot count work it has not captured.

Labels such as maintaining, productive or unproductive summarise the relationship between modelled fitness, training load and sometimes HRV. They simplify a complex training picture.

A training-status label combines several modelled trends, rather than judging the quality of your effort. Depending on the watch, these can include fitness estimates, acute load and HRV. The status can lag your experience or change after a new reading. Read its contributing inputs before changing your plan.

Training effect estimates the stimulus from a session. Aerobic and anaerobic views describe different aspects of the effort, using device-specific calculations. On Garmin, 0 describes no identified effect and 5 is its overreaching label. The scale describes a modelled stimulus, not a grade for how worthwhile your run was.

Training Effect estimates the stimulus of an individual session, often split into aerobic and anaerobic components. It uses a manufacturer’s model and recorded intensity. It does not directly measure the adaptation you will gain. An easy run is meant to have a different purpose from intervals.

On supported devices, this compares your current running response with an established fitness baseline. The score may change during a run.

Performance Condition is a short-term comparison between your current effort and a modelled fitness baseline on supported watches. It often appears after a run has begun. Early pace, heart rate, terrain and recording quality influence it. It is distinct from your overall training status.

These model different things: stamina estimates remaining capacity during an effort, while endurance and hill scores summarise aspects of training capability. Their scales are specific to the device.

Real-time stamina is a model of remaining exercise capacity on certain devices. Some distinguish current stamina from a longer-term potential estimate. The model uses your history and current effort; it is not a direct measurement of glycogen, muscle damage or how much you can safely tolerate.

HRV describes variation in the timing between heartbeats. The calculation and measurement window matter. Compare your own baseline using the same device and routine.

Heart-rate variability describes the variation in time between successive beats. It is not the same as average heart rate. Devices may use different statistics and measurement periods, so compare your own readings from the same method. Your baseline needs consistent data and can change over time.

A readiness score combines selected signals such as sleep, recent load, HRV and recovery estimates. Different brands weight the inputs differently.

A readiness score combines selected recovery and training signals. For example, a device may consider sleep, HRV, recent load, stress and its recovery-time estimate. Different brands weight different inputs. A score is a summary of what the watch knows, and it may miss work, life demands or a developing illness.

A recovery timer estimates when you may be ready for another demanding workout. On Garmin, the emphasis is the next hard session; it is not automatically an instruction to avoid every form of movement.

Recovery time estimates how long until you are ready for another demanding session on supported watches. It does not usually mean you must avoid every form of movement for that many hours. The estimate can update with subsequent activity and recovery signals. Your symptoms and individual circumstances still come first.

Energy scores combine data such as heart rate, HRV, activity and sleep to model daily resources. Body Battery is Garmin’s name for one such feature.

Body Battery is a manufacturer’s estimate of changing energy resources based on signals such as HRV, stress, sleep and activity. Its points are not calories, fuel stores or a measure of willpower. Consistent wear matters, and gaps can leave the model with less context.

Watch stress scores usually model physiological signals, often including HRV during quieter periods. Physical demands and positive excitement can influence the reading as well as emotional strain.

Watch stress usually means a modelled physiological signal, often based on heart-rate variability during periods without exercise. It is not a direct reading of your thoughts or emotions. Physical strain, illness, alcohol and sensor quality can affect it as well as psychological stress.

Cadence is how often your feet step. Many running watches count both feet. It normally changes with your speed and the situation.

Cadence is the number of steps per minute. Some devices or foot sensors display one side and others both; check the definition. It normally varies with pace, stride length, terrain and your own movement. There is no single cadence every runner needs to force.

This describes the distance your watch assigns to a step or stride. Garmin’s running-dynamics definition uses one footfall to the next; check how your device labels it.

Stride-length terminology varies: a device may report the distance associated with a step rather than a full left-to-left cycle. Speed depends on the relationship between step length and cadence. Your measured length changes naturally with pace, gradient and how the device estimates distance.

Ground contact time estimates how long a foot remains on the ground in each running step. Speed, gradient, surface and individual movement all affect the comparison.

Ground contact time is the estimated time a foot spends on the ground during a step. It commonly changes with speed and is measured or modelled differently across sensors. Compare equivalent running, not a sprint with an easy long run. A single value does not describe all the forces involved.

This estimates how ground contact is distributed between your left and right sides. A perfect-looking split is not a complete assessment of your movement.

Ground contact time balance divides estimated contact time between left and right. Some natural variability is expected, especially around bends, on camber or at different speeds. A perfectly even split does not prove healthy movement, and a small difference does not diagnose a problem.

Vertical oscillation describes the up-and-down movement detected while you run. The reading depends on speed, your movement and where the sensor measures it.

Vertical oscillation estimates the up-and-down movement detected by the sensor. The sensor location and your pace affect the value. It describes one part of movement, not the energy cost of your entire run. A lower number is not always a better stride.

Vertical ratio relates vertical oscillation to stride length, expressed as a percentage. Because both parts can change, read it alongside pace and the underlying measurements.

Vertical ratio divides vertical oscillation by stride length and expresses the result as a percentage. Either part can move the final number. A lower ratio can result from a longer reported stride even when vertical movement stays the same. Read the underlying values before judging the ratio.

Running power estimates your rate of mechanical work using a device’s sensors and model. Different products can report different wattages for the same runner.

Running power is a device’s estimate of the rate of work, in watts. The model can use speed, gradient, movement and, on some systems, wind estimates. It is useful for comparing your own sessions within one setup. Running-power numbers are not interchangeable with cycling-power readings or across manufacturers.

Running economy describes the oxygen cost of covering a distance; compatible watches estimate it from running and sensor data. Step speed loss estimates how much you slow as a foot contacts the ground and can contribute to that model.

Running economy refers to the oxygen or energy cost of running at a given speed. A watch estimate is not the same as a laboratory comparison at a controlled pace. Step speed loss describes estimated slowing during ground contact on compatible devices and may contribute to the economy model.

A watch estimates when you sleep and may classify stages or combine them into a score. Time in bed, actual sleep and modelled stages are different views.

Sleep duration, stages and a sleep score are related but different outputs. The watch estimates sleep from movement and other sensors; it does not measure sleep stages like a clinical sleep study. Quiet waking can be counted as sleep, and restless sleep can be missed. Use the pattern alongside daytime tiredness.

Respiratory rate is the number of breaths per minute. Watches estimate it using their available sensors, often during rest or sleep.

Respiratory rate is breaths per minute. A watch estimates it using available sensor signals, often during rest or sleep, rather than directly assessing your lungs. Exercise breathing rate and an overnight resting value are different comparisons. Timing, illness, environment and signal quality can all matter.

Pulse-ox features estimate the proportion of oxygenated haemoglobin using light at the wrist. Consumer readings have important measurement and medical limitations.

SpO₂ is an estimate of the proportion of oxygenated haemoglobin. A wrist sensor uses reflected light, and movement, cold skin, fit and other measurement factors can affect it. Skin pigmentation may also affect accuracy. Consumer features differ in availability and intended use; they are not a substitute for clinical assessment.

A supported watch may track overnight wrist temperature or its change from your baseline. Skin measurements differ from a core-body-temperature reading.

Wrist or skin temperature is influenced by your environment as well as physiology. Many watches show a difference from your own overnight baseline, rather than an absolute body temperature. Bedding, room conditions, wear, cycle-related changes and illness can affect the pattern. It is not equivalent to a clinical thermometer reading.

On supported models, an ECG feature records an electrical heart-rhythm trace and may classify certain patterns. Availability and approved uses vary. This guide cannot interpret a trace or confirm a diagnosis.

A supported ECG feature records a limited electrical heart-rhythm trace. An irregular-rhythm notification usually uses a different background process. The device may classify selected rhythms but does not test for every heart condition. A normal-looking result cannot exclude a heart attack or explain symptoms.

Calorie figures estimate energy use from personal settings and sensor data. Active calories and total calories describe different totals; neither provides a precise account of your food needs. A daily total commonly combines the active and resting parts.

Active calories estimate energy used in activity; resting calories estimate background energy use. A daily total may combine both. The calculation uses a model, your profile and recorded activity, and it can miss or misestimate some demands. Food needs also include recovery and the rest of your day.

Some devices estimate fluid loss from activity and environmental inputs. A modelled estimate cannot account perfectly for your individual drinking and sweating.

Estimated sweat loss uses inputs such as exercise, environment and profile settings on compatible devices. It does not directly collect your sweat or measure its sodium content. Actual needs vary with conditions, your individual sweating, what you drink and the duration of exercise.

Step counts estimate movement from the device’s sensors. Floors or flights may use height changes as well. Arm movement, travel and pressure changes can affect detection.

Steps are inferred from the device’s movement sensors, not counted by watching each foot land. Carrying things, pushing a buggy, arm movement or transport can affect detection. Floors climbed may also use pressure changes. Compare similar routines rather than treating every counted step as identical exercise.

These features summarise activity against the manufacturer’s movement or intensity rules. Some give extra credit for vigorous activity, so displayed minutes can differ from workout duration.

Intensity minutes and activity rings use a manufacturer’s rules for counting movement and exercise. Vigorous minutes may receive extra credit, while some activity may not qualify or may depend on heart-rate settings. Workout duration and credited intensity minutes are therefore different things.