Apple has refreshed its watch line-up with the Apple Watch Series 12 and Apple Watch Ultra 4, and the biggest changes are under the skin rather than on the outside. Both models use Apple’s new S11 chip — not S12 — alongside a redesigned Health Sensing System. Apple says the new setup allows more frequent heart-rate and heart-rate variability measurements, with a new readiness score designed to give a clearer picture of how prepared you are for exercise or a busy day. Series 12 starts at £369 in the UK, while Apple Watch Ultra 4 starts at £749. Both are available…

Read the full article: Recap: Apple Watch Series 12 and Ultra 4 add a redesigned health sensor

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