Apple Watch Ultra 2 models are displayed following Apple's "It's Glowtime" event in Cupertino, California, on Sept. 9, 2024. — Nic Coury/AFP/Getty Images/TNS
The first thing I do each morning is check my watch – not for the time but for my sleep score.
As a runner, when the glowing red letters say my score – and my training readiness – are poor, I feel an instant dread. Regardless, I scroll on, inspecting my heart rate variability and stress level – snapshots that influence the tone I carry into the day.
