If you go into a client's calendar and click on a completed workout bubble it deletes it! Not only does it get rid of the workout history with no way to bring it back. It also deletes the points they got for that workout in any challenge they are a part of. Trainerize customer service has no ability to undo any of it or even adjust the client's points in the challenge. At minimum there should be a pop-up that informs you that you're about to delete a client's previously completed workout and ask you if you wish to delete it.