Whether on purpose or by accident, many times there are activities on the big leader boards that are physically impossible.
An example would be running faster than 3 minutes per mile. Or recording a bicycle ride while riding in a car.
Sometimes this is accidental, because a person forgot to turn off the recording and then drove in their car. Other times, it's on purpose when a cheater tries to game the system.
This needs to be done for segments, as well as for overall activities. There might be an activity with a normal overall speed, but one or more segments were recorded at an impossible speed. Or there might be an activity with no segments, but it shows up on the leader boards as an impossibly fast activity.
There are users who periodically report these super-fast activities, but this takes up a lot of time for users. And also for the support staff who review the reported activities.
This could be automated. If a user uploads an activity that is physically impossible, such as being a lot faster than world record speed for that sport, the app would say something like: "Something is wrong with this activity. It will not be counted for segments or other leader boards."
This would really improve the user experience when looking at leader boards and segments, and reduce user frustration when cheaters attempt to win all the leader boards.