Articles tagged: Apple Watch fitness

Sleep consistency predicts health beyond duration, but the evidence is observational. Learn what regularity means and how four wearables score it.

Recent PSG studies show Apple Watch overestimates light sleep and underestimates deep sleep. Here's how much it's off and what to use for training decisions instead.

Compare eight Apple Watch workout apps by what they adapt, when they update, and whether they track data or maintain a workout plan around changing conditions.

Apple Watch's irregular-rhythm notification catches most real AFib, but in healthy adults under 50, most alerts are false positives. Here's the Bayesian math.

The HRV in your Health app is a misleading average of inconsistent daily readings. Learn the 60-second Breathe-app protocol that gives you a real training signa

Two validation studies show Apple Watch HR lags during deadlifts and pull-ups by 5-15 seconds. It's not a bug—it's wrist-PPG physics. Here's what to use instead

Whoop Memory lets you tell the app about your knee, your travel week, your bad meeting. Useful — and an honest tell about a deeper limit of how wearables coach. Here's what it solves, what it doesn't, and the lane it leaves open.