To track a workout on a smartwatch, open the built-in exercise or workout app, choose the activity that matches what you’re doing (such as outdoor run, cycling, or strength training), wait for the GPS and heart-rate sensors to lock on, then tap start. Your watch records metrics like duration, heart rate, distance, pace, and estimated calories in real time, and saves the session to its companion phone app when you finish. The steps below walk through the process in detail and explain how to fix the most common tracking problems.
Before You Start: Quick Setup Checklist
Accurate tracking depends on a few things being in place before you press start. According to guidance published by Apple, Garmin, Fitbit, and Samsung, the most common causes of bad data are a loose band, a low battery, and skipped permissions. Run through this checklist first:
- Wear the watch snugly. The optical heart-rate sensor on the back needs firm, consistent skin contact—about a finger’s width above your wrist bone. A band that slides around lets light leak in and produces erratic readings.
- Charge above roughly 20%. GPS and continuous heart-rate monitoring are the most power-hungry features on any watch. Long sessions can drain a low battery before you finish.
- Grant location and motion permissions. On first use, the companion app (Apple Health, Garmin Connect, Fitbit, Samsung Health, Google Fit) asks for access to location, motion, and fitness data. Without these, distance and pace won’t record.
- Update the software. Manufacturers regularly ship sensor and GPS accuracy improvements through firmware updates.
If you’re still choosing a device, our guide on how to choose the right smartwatch for your needs covers which sensors matter most for the activities you do.
Step-by-Step: Tracking Your Workout
- Open the workout app. Look for the icon labeled “Workout” (Apple Watch), “Exercise” or a sport pictogram (Garmin), “Exercise” (Fitbit), or “Samsung Health” on your watch face or app list. On most watches you can also assign this app to a physical button for one-press access.
- Select the correct activity profile. This matters more than people expect. Each profile—outdoor run, indoor run, open-water swim, elliptical, hiking, strength—tells the watch which sensors to prioritize and how to calculate calories. Picking “outdoor walk” instead of “outdoor run,” for example, changes both pace zones and the calorie algorithm.
- Wait for the GPS lock. For outdoor activities, stand still in an open area until the GPS indicator turns solid green (or the watch confirms “GPS ready”). This usually takes 5 to 30 seconds. Starting before the lock is the single most common cause of a wrong distance reading.
- Confirm the heart-rate signal. Most watches show a pulsing heart icon once the optical sensor has a stable reading. If it stays hollow or blank, tighten the band and wait a few seconds.
- Tap Start. Some watches give a countdown; others begin immediately. Many also let you set a goal first—distance, time, calories, or a target heart-rate zone—so the watch can alert you when you hit it.
- Glance at live metrics, don’t fixate. Swipe or press the side button to cycle through data screens (pace, heart rate, distance, laps). Raise-to-wake keeps the display off until you look, which saves battery on longer sessions.
- Use pause and lap features when needed. Pause at a stoplight or water break so idle time doesn’t drag down your average pace. Auto-pause, available on many models, does this for you. Tap the lap button to split intervals.
- End and save. Press stop, then choose Save (or End). The watch syncs the session to its companion app over Bluetooth, usually within a minute or two when your phone is nearby.
Understanding the Metrics You’ll See
Knowing what each number means helps you train smarter. Definitions below reflect how manufacturers and health organizations describe these metrics.
| Metric | What it measures | Sensor used | Accuracy notes |
|---|---|---|---|
| Heart rate | Beats per minute, in real time | Optical (PPG) sensor | Generally reliable for steady effort; can lag during rapid interval changes |
| Distance & pace | Ground covered and speed | Built-in or phone GPS | Most accurate outdoors with a clear sky view |
| Calories burned | Estimated energy expenditure | Heart rate + motion + profile data | An estimate, not a clinical measurement |
| Steps & cadence | Movement count per minute | Accelerometer | Reliable for walking and running |
| Training load / recovery | Cumulative strain and rest needs | Combined sensor data | Trend-based; most useful over weeks |
Calorie figures in particular should be read as estimates. Published expert reviews consistently note that wrist-based calorie counts vary between brands, so they’re best used to compare your own sessions rather than as absolute values. For deeper sensor coverage, see our roundup of the best smartwatches for fitness enthusiasts.
Troubleshooting Common Tracking Problems
GPS distance looks wrong
- Wait for a full GPS lock before starting, and start outdoors rather than under a roof.
- If your watch relies on your phone’s GPS, keep the phone with you.
- Tall buildings and dense tree cover can scatter the signal; expect minor drift in those conditions.
Heart rate readings are erratic or missing
- Tighten the band and move it slightly higher on your wrist.
- Clean the sensor and your skin; sweat, lotion, and tattoos over the sensor area can interfere with optical readings.
- In cold weather, warm up first—reduced blood flow to the wrist weakens the signal. A chest strap paired over Bluetooth is the usual fix for serious interval training.
The workout didn’t sync
- Keep your phone nearby with Bluetooth on, and open the companion app to force a sync.
- Confirm the watch and phone are signed in to the same account.
Rugged outdoor watches handle signal-challenged environments differently; our Garmin Instinct 3 review looks at multi-band GPS and tactical features for trail and backcountry use. If battery is your limiting factor on long sessions, see our comparison on which smartwatch lasts the longest.
Frequently Asked Questions
Do I need to carry my phone to track a workout?
It depends on the watch. Models with built-in GPS track distance and pace on their own. Watches without built-in GPS borrow your phone’s location, so you’ll need to bring it. Heart rate, steps, and time are recorded by the watch regardless. If you want to leave your phone at home and still stream music or take calls, you may need cellular service—our guide to adding a smartwatch to your Verizon plan explains how that works.
How accurate are smartwatch fitness metrics?
Heart rate and distance are generally reliable for everyday training, while calorie counts are estimates that differ between brands. Health authorities including the National Institutes of Health note that consumer wearables are useful for tracking trends but are not medical-grade diagnostic tools. Use the numbers to monitor your own progress over time.
What’s the difference between automatic and manual tracking?
Many watches detect activities like walking or running and start logging on their own. Manual tracking—choosing the profile and pressing start—is more accurate because the watch applies the right sensors and algorithms from the beginning and captures the full session, including warm-up.
Can a smartwatch track strength or indoor workouts?
Yes. Most watches include profiles for strength training, HIIT, yoga, and indoor cardio. These rely on heart rate and the accelerometer rather than GPS, so they record effort and duration but not distance. For broader health features beyond exercise, see the latest trends in smartwatch technology.