In an age when every device competes for our attention, Apple is quietly exploring the opposite impulse — a wearable that watches without being watched. The company has built early prototypes of a screen-less fitness band, echoing the philosophy of trackers like Whoop, that would gather intimate data about sleep, recovery, and exertion entirely in the background. With a launch no earlier than 2028, this is less a product announcement than a signal: even the world's most prominent screen-maker is asking whether the next frontier in health technology might be one that demands nothing of your eye