This one:

https://www.amazon.com/Freein-Inflatable-Stand-Paddleboard-Conversion/dp/B07MCQZR5J/ref=mp_s_a_1_3?dchild=1&keywords=freein+paddle+board+inflatable&qid=1624885045&sprefix=freein&sr=8-3#video-immersive-view_1625318455593

I’ve been testing surfing in choppy ocean waves. Difficult. Kneeling is more stable. Try rubbing your wet deck as hard as you can on your knees in and top of your feet and toes for an hour and watch what happens.