Blog
Short, sourced explainers on the numbers behind your score — training load, recovery, sleep and heart rate.
Latest articles
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Training
What Is TRIMP? The Training Metric Your Watch Already Tracks
How your watch turns heart rate into a single training-load number.
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Science
What Is a Good Readiness Score? Scores Explained
What separates a score in the 70s from one in the 30s — and what to do about it.
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Training
How the Acute-to-Chronic Workload Ratio Helps You Manage Injury Risk
Why the ratio between recent and long-term training load is linked to injury risk.
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Recovery
Heart Rate Variability: What Your HRV Actually Means
What the tiny gaps between heartbeats reveal about your nervous system.
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Product
Free Whoop Alternative: Readiness Scores, No Sub
Daily readiness and HRV tracking on the watch you already own, no subscription.
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Training
Heart Rate Zones: Why the Karvonen Method Is More Accurate
Why heart rate reserve builds more accurate zones than percent-of-max.
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Sleep
Why Sleep Stages Matter More Than Duration for Recovery
Why six hours of good sleep can beat eight hours of restless sleep.
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Science
Apple Watch Fitness Scoring Without Extra Hardware
Turning the data your watch already collects into one daily score.
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Training
Training Load vs. Training Volume: Why Harder Isn't Always Better
Why how your body responded matters more than how much you did.
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Recovery
Resting Heart Rate Trends: What Your RHR Reveals
What a rising or falling RHR trend is quietly telling you about your fitness.
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