When you update your training zones, only new workouts are calculated with those zones. Your history keeps the old ones, which makes comparisons misleading.
You can run a recalculation to align past workouts with your new zones.
Run the recalculation
Go to Settings, then the Training zones tab.
Click Recompute of zones on workouts at the top right.
Choose the period to apply the recalculation to.
📌 Good to know
The recalculation overwrites the time spent in zones over the chosen period. This is useful after a test that changes your reference values, but think about the period: recalculating a whole season with today's zones erases the progress you wanted to see.
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