Did you upload a bad GPS file, or maybe you just don't want a certain ride or run uploaded to Strava? No sweat - it's easy to delete an activity from your Strava account.
First, go to the Activity page for the Activity you want to delete. At the left of the map; click the Wrench icon and select "Delete Ride/Run" from the drop-down menu.
And that's it - your Activity is gone from your Strava account.
Keep in mind that although you may be able to re-upload Activity after you delete it (if you have the GPS file saved elsewhere), you will lose all Comments and Kudos you've received on that ride or run.