Garmin Connect: Delete more than one activity at a time (e.g. by adding checkboxes on activity page)

It should be possible to delete more than one activity at a time. This would be easy to implement by adding a checkbox next to each activity in the list. And one checkbox “Select all”. When the user selects a checkbox, a button “delete selected activities” would appear. This is similar to many email clients and would conform to the user's expectations for user interfaces.

Even better would be if there was a filter to select all activities from a certain timeframe or before a certain date, to delete them (or export them)