Hi @prenaud, it's nice to see you again participating here in the Community Forums, welcome back!

Thanks for bringing this to my attention and for the details that were shared in your post. To avoid the Fitbit to erroneously detect a Run or Walk activities, I suggest you to adjust your stride length settings. First, you can measure your stride length manually and then add it to your Fitbit account. How to measure it? Please follow the next steps:

1. Go to a place where you're sure of the distance, such as a track.
2. Count your steps as you walk or run, making sure you travel at least 20 steps.
3. Divide the distance traveled (in yards or meters) by the number of steps you took to determine your stride length. If needed, convert your stride length into inches or centimeters.

Then, please add your stride length in the Fitbit app following the next steps:

1. Tap the Today taband tap your profile picture.
2. TapAdvanced Settings> Stride Length.
3. Adjust your stride length.

Let me know if the issue persists, I'll be here if you have any additional questions.

Thanks @RicardoFitbit for the suggestion. I guess I could try it. This would work well when I go for brisk walks, but it would mess up the data for my every day walking, wouldn't it? Too bad we cannot select the minimum speed required to get the exercise app started. It seems that it would make more sense to me.