A series of instructional videos - TWS (https://www.tws-windsurf.com) Tuning Technique Series together with wave world champion Victor Fernandez, Head of Fanatic Wave gear R&D Klaas Voget and professional windsurfer Adam Lewis. In the fifth episode we talk about flex fins. Should you put the flex fins in the centre, in the side, and why? Camera & editing: Bartek Jankowski (https://www.bj-productions.com)