If you do not often sit when you ride an upright or cycling bike seat will work fine.
Exercise bike seated position.
However if you want more comfort the seated position of a recumbent bike is the best option.
Then climbing onto your bike place your heels on your bike pedal and extend one foot to the bottom of your pedal stroke.
Those people who are more comfortable in an upright sitting position or leaning backwards may prefer a recumbent bike as opposed to an upright bike.
This is a good starting point for most people.
Although avid cyclists will spend time and money having their road bike fit precisely to their bodies exercise bike owners might overlook proper fit.
Place your thumb on top of your hipbone and make sure your palm lies flat on top of the bike seat.
The resistance on an upright or recumbent bike is usually controlled digitally.
Improper seat position can hurt your knees.
If you have a very slight bend in your knee with the heel on the pedal your seat is at the right height for your legs.
Your elbows should be slightly.
The top of the seat should be in line with your hipbone.
When you sit comfortably in the saddle you should be able to easily reach the tops and brake hoods on a road bike or the grips on a mountain bike.