Nah, it's trivial. They're called recumbents. More usefully, upright bike saddle fit is largely about the spacing of your sit bones. There's tutorials online o

Nah, it's trivial. They're called recumbents. More usefully, upright bike saddle fit is largely about the spacing of your sit bones. There's tutorials online on how to measure that, and some saddles tell you what spacing they're designed for. The alternative is to go to a proper bike shop and try a variety of saddles to find on you like. But it's tedious, because seat height, handlebar height, handlebar distance, seat to pedal horizontal distance and fore-aft tilt all affect that too. If it really bothers you pay for a "bike fit", there are people who do this for a living and can make a huge difference to how you feel on the bike.