Here are some Opti training Youtube videos from 2018 Australian and New Zealand Champ Fletcher Walters.
Feel free to share on your Opti Facebook page or website if they are helpful for your Opti sailors.
Sailing and Bailing https://www.youtube.com/ watch?v=NOqZBpDAicw
Simple Opti Fitness Workout https://www.youtube.com/ watch?v=V5DgoBP5NIw