Apple's Gemini-powered Siri could transform into an AI health coach for Apple Watch users

Apple is collaborating with Google to power the next generation of Siri with Gemini, opening the door to a sophisticated AI health coach. According to ZDNET's health editor, who tested Google's Fitbit Air and AI Health Coach, the combination of a chatbot with wearable data (sleep, exercise, stress) yields personalized recommendations. If Apple implements this, Siri could connect information across the Health, Journal, and Apple Watch Fitness apps, automatically logging moods, providing daily readiness scores, and offering bedtime nudges — without manual entry. The software revamp is expected to be announced at WWDC 2026.

However, privacy is a major concern. Apple has long marketed its devices as secure and encrypted, while Gemini runs on Google's cloud. To maintain trust, Apple must configure Gemini to match its own privacy standards — potentially running AI inference on-device or using differential privacy. The challenge is to create a health assistant that feels distinct from Android's offerings while leveraging Google's AI prowess. If successful, the Apple Watch could shift from passive tracking to proactive health coaching, rivaling services like Whoop and Fitbit Premium.