Fitness Technology

The notification popped up on Sarah’s Apple Watch at 6:47 AM: “Recovery Alert: Your body shows signs of elevated stress. Consider a light workout or rest day.” She felt fine. Actually, she felt great. The marathon training was going perfectly, her energy levels were high, and she had planned an intense 18-mile run. But something made her pause—this was the same watch that had accurately predicted her plateau three weeks earlier. ...

Your Apple Watch says you burned 847 calories during that “intense” Netflix binge. Your Fitbit claims you climbed 47 flights of stairs while sitting at your desk all day. And somehow, your Garmin thinks your resting heart rate dropped to that of a hibernating bear after you forgot to charge it overnight. Welcome to 2026, where wearable technology officially tops the American College of Sports Medicine’s fitness trends list for the second year running—but nobody wants to talk about the massive elephant in the room: these devices are lying to you. ...