Stand up paddle surfing and stand up paddle boarding (SUP) is an offshoot of surfing that originated in Hawaii. Unlike traditional surfing where the rider sits until a wave comes, stand up paddle boarders stand on their boards and use a paddle to propel themselves through the water. The sport was documented in a 2013 report that identified it as the outdoor sporting activity with the most first-time participants in the United States that year. Variations include flat water paddling for outdoor recreation, fitness, or sightseeing, racing on lakes, large rivers and canals, surfing on ocean waves, paddling in river rapids (whitewater SUP), Paddle board yoga and even fishing.
Stand up paddlers wear a variety of wet suits and other clothing, depending on water and air temperature since most of their time is spent standing on the board.
Performance surf boards were traditionally made from laminated layers over foam cores. SUP boards are larger boards and the desire to travel with them has led to the development of an inflatable system where the board and pump can be carried in a back pack. The core material is called 'drop stitch'. Thousands of locked nylon stitches keep the board at a specific thickness. Pressure from specially designed hand pumps can inflate a board to over 30Psi. This creates a board not much less rigid than a hard board. This makes inflatable boards both durable and transportable.