Fitness graph - question

[Pierpaolo_Zeni]

Hello guys,
I was looking at my fitness graph and I have noticed a bubble drawn in the graph, does anyone know what it is ?
please see the attached pic

[nasatt]

Track the best efforts along with the fitness curve

This just got done. Achievements (ftp up, best power for season etc.) are now shown as little stacked dots under the fitness chart and with the activity summary at the bottom: [Screen Shot 2021-02-03 at 21.34.45]

[Cooper]

I think you clicked on this field in a calendar entry and created the entry on the fitness line

[david]

@Cooper is correct. You have a 1500m test on that day with the box ticked:

[Pierpaolo_Zeni]

great, thank you for all your answers! all clear now!
cheers