Delete by external id

Hi,

While trying to upload Garmin data for one of my athletes, I accidentally uploaded all of his activities into my own account. Each of his activities has a different external ID than mine.

Is there a way to delete only his activities from my account without affecting my own data?

Thanks in advance!

Check the filters to see if anything is usable as a differentiator. I would think that the power meter serial is a good one for rides.