The following is an excerpt from HPV Deutschland e.V..
"Human-powered vehicles include land, air and aquatic vehicles. These vehicles are powered solely by human muscles. They don't use any form of stored energy."
HPVs can be divided into three main categories:
Air = Human Powered Aircraft (HPA),
Sea = Human Powered Boats (HPB),
Land = Recumbents and Handcycling.
Handcycling is the fastest growing sport within the disabled community. The handcyclist rides a three wheeled bike that is totally powered via arm power. Handcycles vary greatly in style and performance.