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Reading Why this?

Every prescription can be interrogated, and the answer is generated by the engine, not the model.

Tap Why this? on any prescription and Mettle shows the actual reasoning: you topped the rep range last time, so the load went up five pounds and the reps restarted at six.

Why this is trustworthy

The explanation is produced by the same deterministic engine that produced the numbers. It is not a language model narrating a decision it did not make, which is how most apps do it and why their explanations can be confidently wrong.

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