The Best Standup Paddleboards of 2021 Share now: Support us! GearJunkie may earn a small commission from affiliate links in this article. Learn more. Home » Water » SUP » The Best Standup Paddleboards of 2021 Looking to invest in a standup paddleboard? Don’t know where to start? Check out our list of the best SUPs of 2021. Standup paddleboarding is one of the fastest-growing water sports of the decade. There’s a good chance you’re familiar with standup paddleboarding, but if you aren’t, here’s what you need to know. Standup paddleboarding, or SUPing, is the act of standing on a hard epoxy or inflatable board tapered at both ends, and using a paddle to move through the water. Similar to a surfboard, paddleboards also have fins on the bottom that help to move and steer.