Various models to choose from including the older dual action bike where the arms move back and forth as you pedal giving you an all over workout .

The Magnetic Resist bikes are quiet and smooth and wont annoy others,
they are  especially good for people with  leg or knee injuries.

Programmable bikes also have magnetic resistance
and will usually have 5-6 programs and a heart rate monitor.

Recumbent bikes are usually easier on the back as they have a large seat with a back.