Strain & Activity
What the 0–100% Daily Strain reading measures, how a Target Strain Zone is set, and what happens when you train without a watch.
3 articles
Articles in this category
- How Daily Strain and the Target Strain Zone are calculated Daily Strain is an absolute 0–100% reading of the cardiovascular and muscular load your day actually produced. Here is how it is built and targeted.
- Heart-rate zones and how intensity becomes strain Zones 1–5 are a session-detail view computed on your phone. Strain uses the same heart-rate reserve, but accumulates it as impulse rather than zone time.
- Strain without a smartwatch, from phone steps When no watch covered the day, Grio observes movement from your phone's step count instead of leaving Daily Strain permanently blank.
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