What is SUP?
Wikepedia info about
SUPing- Stand up paddle surfing
(SUP), or in the Hawaiian language Hoe he'e nalu, is an emerging global sport with a Hawaiian heritage. The sport is an ancient form of surfing, and reemerged as a way for surfing instructors to manage their large groups of students, as standing on the board gave them a higher viewpoint, increasing visibility of what was going on around them - such as incoming swell. To begin with, this started with using a one-bladed paddle, whilst standing on a normal length surfboard. The popularity of the modern sport of SUP has its origination in the Hawaiian Islands. In the early 1960s, the Beach Boys of Waikiki would stand on their long boards, and paddle out with outrigger paddles to take pictures of the tourists learning to surf. This is where the term "Beach Boy Surfing", another name for Stand Up Paddle Surfing, originates. 
The sport benefits athletes with a strong 'core' workout. SUP'ing is popular at warm coastal climates and resorts, and is gaining in popularity as celebrities are sampling the sport, and cross-over athletes are training with SUP. SUPs have been spotted around the globe, anywhere where there is easy access to safe waters, as well as in the surfing lineups of the world.