When you Google kneeboarding you probably see a bunch of sites listed for the kind of kneeboard where your dragged behind a boat on a lake. That's not what I'm talking about, how pathetic. That's wakeboarding and I want surfing. I mean the ones where you ride waves baby! These animals prefer to "knee it". These were orignally made popular by George Greenough in the late 1960's and early 1970's. Although the species is past its peak they persist probably due their ability to get in the barrel.
A kneeboard is very short, down to about 5ft or just under. It is very similar to most fishboards in that it they they are wide throughout with a wide tail, and wide, rounded nose. Many also have a rubber pad built in to the deck to add a little more comfort to those bony knees. Kneeboarders use fins for added propulsion and because they there not going to stand anyway.
My only experience with kneelos is when I blow my take off, particularly on my twinzer fish, and I just have enough time to get to my knees and ride the wave. I still see some guy at Linda Mar in Pacifica from time to time, getting a wave on that kneeboard, his long white beard flowing beneath him, and I swear I can hear "Echoes".