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what your data means.

Your devices generate a lot of numbers. Here's what they actually mean, and what to do about them. Clear, answer-first explanations for people who want to understand their data, not just collect it.

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Read the why. Then act on it.

Latest in Stress

What Your Window of Tolerance Is and Why It Shrinks Under Chronic Stress

Your window of tolerance is the arousal range where you can handle stress, and chronic stress can narrow it.

8 min read · October 2026Read

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More coming soon: WHOOP strain scores, sleep stage breakdown, HRV baseline methodology, and Apple Watch workout metrics.