To delete videos from within the Sports App, go to the iPhone Files folder. Select “On My iPhone”.  Open the PR Sports/CapturedVideos folder, in the upper right corner select the circle with the 3 dots inside. Select and delete the video files that you no longer want. The Videos stored here are raw videos that don't have the velocity embedded. When you delete these videos, the App won't be able to display the videos afterward. This will free up space on your phone and will allow you to keep speeds within the app session, but it will remove the associated videos.