Something about sitting in a kayak hurts, and I’ve paddled probably 30 different ones over the years. They all hurt. Even in a top of the line sit on top with awesome chair, it still hurts. I have no idea why but it does. I can sit in my aluminum canoe with a flat metal seat for 13-14 hours and not even feel uncomfortable, much less hurt. It doesn’t really make sense. Maybe it’s the freedom of movement, I don’t know. I remember kayaking one time in some swift water and my left leg went completely numb, I’ve never felt anything like that before or since. I beached the boat and walked around a while, it went away