Unfortunately, we don't have a bulk select tool to delete multiple activities simultaneously. The most accessible way to delete activities one by one is from My Activities or your Training Log under the Training tab. Don't hesitate to contact our support team if someone else's device history was uploaded to your Strava account.
Can I Delete Multiple Activities in Bulk?
Find out whether Strava lets you delete multiple activities at once, and learn the quickest way to remove them one at a time in the meantime for now.