ISA: Increased Swell Produces Powerful Performances for SUP Surfing at El Sunzal 0 33 01 Dec 2019 14:04 Playak A rise in swell at El Sunzal provided an excellent canvas for the world’s best SUP surfers to perform on the sixth day of competition at the 2019 Surf City El Salvador ISA World SUP and Paddleboard Championship.