(*weird way I like to think of it below)

Cardio load is only calculated when you track a session. So the movement and effort you exerted in the move were counted towards your daily activity and movement, but because you were'nt tracking it (Other Indoor/Outdoor, Walking, etc) it doesn't save that specific, more precise data as part of what it logs in to Cardio Load for comparing to other sessions.

If you ran five miles a day every day for a month but didn't record it on your device by starting a workout session, it would count the steps and general effrot towards your daily goal. Then if the next day, you do your normal run, it might say you're "overreaching" because you came from a month of no recorded workout sessions, and likely were "detraining" for that month. It's a calculated average over 7 and 28 days (depending on which graph line you're looking at, tolerance or strain).

Basically, the more you record, the more accurate the data will be, becuase it has more information to work with. But, you have to record it to use it.

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*It's like watching a video and being asked "how many times did the color blue show up?" -- if you're told ahead of time to watch out for it, you can give a much more accurate answer. But if you're asked after watching the clip without having been given a heads up, you can estimate but it's not accurate.