A live session on your wrist.

Start from your Watch, and the timer, heart rate, and calories roll in on your phone in real time. End on either device — your notes wait where you'll actually sit down to write.

• Real-time heart rate, calories, and elapsed time, captured via HKWorkoutSession
• Standalone mode: your Watch can record even if the phone is away
• Automatic recovery if either device loses signal mid-session
• Lock screen Live Activity so you always know a session is running

See also: Privacy-first · Partner