Fitbit Air lost my open water swim data for hours. The fix is to record swims…
Tag: Heart Rate Accuracy
Fitbit Air Arm Sleeve: Excellent Bicep HR Accuracy Confirmed
No Fitbit Air arm band exists yet. This is how I wear the Air pebble on…
Fitbit Air – We Got A Problem – Cadence Lock
Fitbit Air produced cadence-locked HR during an indoor treadmill interval session, averaging ~157 bpm against a…
Fitbit Air vs Amazfit Cheetah 2 Ultra: Bike Sprint HR Test
The Amazfit Cheetah 2 Ultra returns ±3 bpm limits of agreement in a road bike sprint…
Amazfit Cheetah 2 Ultra: HR Accuracy in a HYROX Sim – plus SmO2 Sensor
The Amazfit Cheetah 2 Ultra was put through a HYROX simulation in a gym at 33°C.…
Huawei Watch Fit 5 Pro Review: Ultra 3 Looks, Third the Price
The Huawei Watch Fit 5 Pro looks like an Apple Watch Ultra 3 at a third…
Polar Street X Review 2026: Battery, HR, GPS Tested
Polar Street X tested across battery life, heart rate accuracy, GPS, sleep staging, and 170+ urban…
WHOOP’s Biggest Heart Rate Algorithm Update Yet — Here’s What Changed and Why It Matters
In February 2026, WHOOP deployed its most significant heart rate algorithm revision to date. This explainer…
the Apple Watch Ultra 3 Review – detailed, definitive, the best
After 100+ hours of sports testing, Apple Watch Ultra 3 earns 88/100 — a great smartwatch…
Garmin 970 vs AWU3: GPS Accuracy Deep Dive
The ultimate 4-watch GNSS showdown! A decade-long test adds the Garmin 970 and Apple Watch Ultra…
