Morning Exercise Linked to Lower Risk

Analysis of minute‑by‑minute Fitbit heart‑rate data from more than 14,000 opt‑in participants found that people whose elevated‑heart‑rate bouts occurred in the morning had substantially lower odds of several cardiometabolic conditions (e.g., 31% less coronary artery disease, 30% less Type 2 diabetes). The result is observational and the authors acknowledge confounding (sleep, hormones, lifestyle), but it shows how wearable datasets can reveal timing‑related health patterns not visible in coarse activity measures. — If robust, this could shift public‑health advice, employer/insurer wellness incentives, and how researchers use wearable data to target behavior timing rather than only duration or intensity.