When playing competitive basketball, I can't wear my watch during games. I manually add these activities afterward, but they don't contribute to my Cardio Load score, which makes my training data incomplete.

Since Fitbit tracks my heart rate during training sessions, the app could estimate Cardio Load for manual entries based on my historical data. This would give a complete picture of my overall training load.

@perija_23 Your Fitbit doesn't track heart rate if you aren't wearing it. You need heart rate data to calculate Cardio Load.

I understand that heart rate data is needed to calculate Cardio Load. My suggestion is that Fitbit could estimate Cardio Load for manually entered activities based on my previous tracked sessions of the same sport.

For example, since I wear my Fitbit during basketball training sessions, the app already has data on my typical heart rate zones and intensity patterns for basketball. When I manually add a basketball game with duration, the app could use this historical data to provide an estimated Cardio Load, similar to how it estimates calories burned for manual entries.

This would give athletes who can't always wear their devices during competitions a more complete view of their overall training load.

@perija_23 To reply to your first sentence, simply stated, that's not how this stuff works. As for manually logged activities, I can tell you how this stuff works. There is a reference source called The Compendium of Physical Activity. It is the database that lists METs (metabolic equivalents) for practically everything. One MET is you at rest. Fitbit calculates the calorie burn using the MET equivalent of an activity, its duration, and your BMR.

Fitbit exercise records aren't sorted and analyzed bit activity type. It doesn't compare records.

Thank you for the detailed explanation—I appreciate you clarifying how Fitbit uses the Compendium of Physical Activity and METs for calorie calculations.

I understand your point, but I respectfully disagree that manual activities should receive 0 Cardio Load.

When manually logged activities don't contribute any training load value, it negatively impacts my next day's Fitbit training recommendations, even though I completed significant cardio work. That seems counterintuitive to accurate fitness tracking.

@perija_23 I'm not saying that that manual activities 'should' or 'should not' receive 0 cardio load. You need heart rate data to calculate cardio load, so manual activities when you aren't wearing your Fitbit can't measure cardio load. For example, running intervals will give you a larger cardio load than steady state running.

You can personally estimate your cardio load from your historical records and keep track of it. Fitbit can't do this for you.