Apple

I’ve spent a week with Apple Watch Ultra 4 – and it’s shaping up to be a serious endurance watch

Wed, 16 Sep 2026 · By Endurance Wire

Get full access to premium articles, exclusive features and a growing list of member rewards. It’s a pretty similar upgrade to the Series 12, which you can read my preview of here — it gets the redesigned rear as part of the new health-sensing system, there’s a new S11 chip inside with a Secure Enclave and separate always-on processor, a new Readiness Score that looks set to take on Oura and Whoop , two new AI features will begin rolling out later this year, and it can deliver HRV (heart rate variability).