The Kayak Forward Stroke video: https://amzn.to/3e9Y96g
Dawid Mocke’s YouTube channel: https://www.youtube.com/user/dmocke
Mark Sundin’s excellent review of the Epic V9 Surfski: https://www.youtube.com/watch?v=lrfro2Chl3I
DIY kayak ergometer indoor paddling device that lets you work on your stroke and your balance indoors: https://www.youtube.com/watch?v=JHc1xxfcW9s