This article is from the Bicycles FAQ, by Mike Iglesias with numerous contributions by others.
There are many reasons to consider a recumbent. First and foremost
is comfort. When you ride a recumbent bicycle you will no longer have
an aching back, stiff neck, numb wrists or a sore a sore bottom. You
will sit in a relaxed easy-chair position. You will be able to ride
longer with less fatigue and arrive at your destination feeling
refreshed. The recumbent position offerd you a great view of the
countryside. While seated you will look straight ahead. This allows your
lungs and chest more open and free breathing. Recumbents are very
versatile machines. They can be used for a wide range of applications:
recreational/sport riding, for the daily commute, a fast double century
and they are great for long distance touring.