I'm new to this forum, so if this is a common style of bent, please be kind.
Today I saw a recumbent, but instead of pedaling with his feet, he was "pedaling with his hands". That is, he was moving a bar like contraption up and down with his hands. The bike had pedals and crank, but he was not using them. It looked like a short wheelbase recumbent in all other respects.
What was that? I'm just curious. I was going to ask the rider, but he turned and went in another direction, before I could ask.