Why would you? Well sometimes it's a bit too lumpy or windy for SUP or you might just want to use a different set of muscles. In my case I'm heading out on a bit of road trip and wondering how it would be to bring one board for ALL occasions. I love both standup and prone surfing. I've prone surfed (is that how you refer to it) my McTavish 9'6 and found it doable but a bit too big. Has anyone tried prone surfing a Starboard Pocket rocket, or pro 9'1 for instance. Interested in any feedback on prone surfing different boards.