Source: One More Try!
Here’s a great practice app for various skills that you can learn through repetition.
Once you click start, record yourself doing the skill you want to work on. The video is delayed, so you won’t see yourself doing the skill. When finished, click the replay button. The website will loop your video, letting you practice with yourself.
You can also download the video to watch later. It is a pretty cool site, everything is done locally in your browser, so there are no accounts that need to be made or privacy issues to worry about. In fact, the whole project is open source, so you or your students can dive on in and start adding custom features!