We're talking recumbent EXERCISE bikes here....they are stationary.Just know that recumbent bikes can be kinda tricky at a stop.
If/when you start to topple you can't "put a foot down" in quite the same way as you can from a "regular" bike.
You are essentially half way on your back - think this through, a 10 (now 24, 27 or some HUGE number) speed may be a MUCH better idea.
Less to learn, you learned it all as a kid, etc.
Not saying you can't learn to save it in a potential topple, just that you will have a new recovery skill to learn.