EP36 - October 15, 2025 - Deep Dive chat on Coros Apex 4 (ft_ AI Insights)

Chapter list to be added

Can a blood pressure cuff fit inside a watch strap? The Huawei Watch D3 says yes. THE5KRUNNER puts the science under the microscope.

Chapters: 00:00 Ecosystem defender, not Whoop killer: the convergence point across three reviews 03:27 The sensor paradox: Gen 4.1 in a $199.99 device, and why Garmin's explanation doesn't hold 06:15 Six structured accuracy tests: where wrist placement works and where it fails 09:07 The biceps fix: repeat interval test results after moving off the wrist 10:24 DCRainmaker's cold weather finding and the auto-detect failure mode 12:10 15 nights of sleep data: resting heart rate, HRV, and time awake 15:04 Sleep stages: why TechRadar and The5KRunner reach opposite conclusions 16:56 Buyer verdict: who should buy, who should not, and what the data says Sources: the5krunner.com: Garmin CIRQA Band Review TechRadar: Garmin CIRQA Review — Matt Evans DCRainmaker: Garmin CIRQA Accuracy Deep-Dive — MORE FROM THE5KRUNNER — the5krunner.com Sign up for The Deep Dive Digest newsletter Subscribe to the5krunner

Garmin Buys TrainingPeaks: The $100M Data Masterstroke (ft. AI Insights)Garmin just bought TrainingPeaks. Your training vocabulary — TSS, normalised power — is now legally owned by their biggest hardware rival's new parent.

Garmin CIRQA at $199.99: Whoop annoyer or genuine rival? THE5KRUNNER unpacks the launch day reality.