Uploaded March 2026 | Updated September 2026, 2 weeks ago

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🔴 COROS Pace 4 on Amazon*: geni.us/COROSPace4
🔴 Anything on Amazon*: geni.us/thequantifiedscientist

🔴 Eight sleep best $$$ (€) discount*: eight-sleep.ioym.net/TheQuantifiedScientist + add code “TQS” for full discount

🔴 Whoop Strap MG / 5.0*: join.whoop.com/QuantifiedScientist
(best $$$ off any new WHOOP membership)

🔴 Oura Ring Link: I recommend you search for a discount on reddit with the "Refer-A-Friend" program! If you can’t find one: ouraring.sjv.io/Oura4 * (affiliate link that supports the channel, but doesn't have a discount)

🔴 Best Running app Runna*: web.runna.com/redeem?code=QUANT

🔴 Strava Premium 20%*: strava.com/subscribe/checkout?code=QUANTIFIEDSCIENTIST

🔴 Levels CGM app best offer $$$ (USA only!)*: levels.link/QS

🔴 Anything on Amazon*: geni.us/thequantifiedscientist

☝️Affiliate* (paid) links. Supports the channel, doesn't cost you any more!☝️
🟢 Instagram: instagram.com/quantified_scientist
🟡 Strava: strava.com/athletes/5206985
🟠 Shorts: youtube.com/@smartwatchshorts
🔵 Newsletter: robterhorst.com
🟡 Twitter: @QuantifiedRob
* Affiliate (paid) links support the channel by earning me a commission on any sale, and it doesn't cost you any more! My opinions are completely my own, and this content is not sponsored.
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PodCast: (soon to come) youtube.com/@FitForScience @FitForScience

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Video edited by Alex: https://linktr.ee/allexb

📸My Gear* (paid links, supports the channel and doesn’t cost you any more)📸
Camera body (main): geni.us/SonyA6600_body
Camera lens (main): geni.us/SigmaContemporary
Camera (B-roll 1): geni.us/Sony_ZVE1
Camera (B-roll 2): geni.us/CanonEosM50MarkII and geni.us/Sony_ZVE10
Light: geni.us/Godox_VL150
Softbox: geni.us/NiceFotoSoftbox
Light stand: geni.us/WalimexLightstand
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Reference devices:
ZMax + Dreamento: biorxiv.org/content/10.1101/2023.08.18.553744v1 & github.com/dreamento/dreamento
Polar H10: pubmed.ncbi.nlm.nih.gov/31004219
🔴 Polar H10: geni.us/hnXc

0:00 Introduction
0:55 Coros Pace 4 Heart Rate Tracking Review
1:31 Heart Rate Tracking: Indoor Cycling
4:55 Heart Rate Tracking: Running
8:21 Heart Rate Tracking: Outdoor Cycling
11:30 Heart Rate Tracking: Weightlifting
14:12 Sleep Stage Tracking
19:05 Sleep Stage Tracking Competition Comparison
21:38 GPS Tracking: Running
24:52 GPS Tracking: Outdoor Cycling
28:23 Overall Conclusion and Final Thoughts