Your zones come from your thresholds, and you have a separate set per sport — running pace, bike power, swim pace. They live on Zones.
If a threshold is missing, sessions in that sport can only be prescribed loosely, because there is nothing to prescribe against. That is one of the checks in Check my setup.
Your coach will not quietly change a threshold. If it thinks one is out of date, it will say so, and it will normally suggest a test rather than guessing a new number from your training.
If a prescribed pace feels wrong for you, say so — the threshold behind it is the thing to fix, not the individual session.
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