A paddle board, also known as a stand-up paddleboard (SUP), is a type of surfboard that is propelled by a person standing on the board and using a paddle to move through the water. Paddle boards come in various sizes and shapes and can be used for a variety of activities such as recreational paddling, yoga, fishing and even racing. They are typically made of a foam or inflatable material and can be used in both calm and choppy waters.