Not everyone owns a smartwatch — and that’s fine. Your iPhone already tracks steps, walking distance, flights climbed, and several mobility metrics automatically, without any wearable at all. The data goes straight into Apple Health, where apps can read and analyse it. You won’t get heart rate or sleep stages, but you can still build a meaningful fitness baseline from your phone alone.
Here’s how to make sure your iPhone captures everything it can.
What Does Your iPhone Track Without a Watch?
Your iPhone contains a motion coprocessor and barometer that work silently in the background. From these sensors, Apple Health receives steps, walking and running distance, flights climbed (one flight equals roughly three metres of elevation gain), and mobility metrics including walking speed, step length, walking asymmetry, double support time, and walking steadiness.
These mobility metrics require an iPhone 8 or later and work best when you carry your phone in a trouser pocket. Apple Health calculates them from your walking patterns over time and displays trends rather than single-session snapshots.
Your iPhone can also estimate sleep duration if you configure a Sleep Schedule in the Health app — but it tracks when you’re likely in bed based on phone usage, not actual sleep stages. For true sleep staging (Light, Deep, REM), you need a wearable.
What your iPhone cannot track without a wearable: heart rate, heart rate variability (HRV), blood oxygen, respiratory rate, skin temperature, workout heart rate zones, and sleep stages.
How Do You Enable iPhone Health Tracking?
Most of these features are on by default, but it’s worth verifying:
Step 1: Open Settings → Privacy & Security → Motion & Fitness. Make sure Fitness Tracking is toggled on. This is the master switch — if it’s off, your iPhone records nothing.
Step 2: Open Settings → Privacy & Security → Location Services → scroll to the bottom and tap System Services. Enable Motion Calibration & Distance. This improves step count and distance accuracy by using GPS data to calibrate the motion sensors.
Step 3: To track sleep duration, open the Health app → Browse → Sleep → Get Started (or tap your existing Sleep Schedule). Set a consistent bedtime and wake time. Your iPhone uses these windows plus phone activity patterns to estimate when you fell asleep and woke up.
Step 4: Open Health → Profile → Apps and confirm that apps you want to share data with (like ScoreVitals) have read access to the relevant categories.
How Do You Get the Most From iPhone-Only Tracking?
Carry your phone consistently. The iPhone can only count steps when it’s on your body. Leaving it on a desk, in a bag across the room, or on a charger means zero steps recorded for that time. A trouser pocket gives the best accuracy — arm swinging without the phone (like pushing a pram) won’t register.
Pair a Bluetooth heart rate monitor. If you want workout heart rate data without buying a smartwatch, a Bluetooth chest strap like the Polar H10 paired with a workout app can write heart rate data to Apple Health during exercise sessions. This gives ScoreVitals the data it needs for TRIMP-based session scoring.
Pair a smart scale. A Bluetooth or Wi-Fi scale from Withings, Renpho, or Eufy can push weight and body fat percentage to Apple Health, filling in the body composition pillar that your iPhone alone can’t address.
Log workouts manually if needed. You can record a workout in Apple Health → Browse → Activity → Workouts → Add Data. Without heart rate data, the workout won’t receive a detailed score, but it still contributes to your activity tracking.
Your iPhone is a solid starting point for fitness tracking — and a Bluetooth heart rate monitor unlocks much more. Download ScoreVitals to see what your iPhone data can already tell you about your daily fitness baseline.